{"id":2445,"date":"2026-10-30T07:15:53","date_gmt":"2026-10-30T11:15:53","guid":{"rendered":"https:\/\/www.mostdomain.com\/blog\/?p=2445"},"modified":"2026-10-30T07:15:55","modified_gmt":"2026-10-30T11:15:55","slug":"which-characters-are-not-allowed-in-domain-names","status":"publish","type":"post","link":"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/","title":{"rendered":"Which Characters Are Not Allowed in Domain Names?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.mostdomain.com\/\" data-type=\"link\" data-id=\"https:\/\/www.mostdomain.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Mostdomain<\/a> &#8211; A client once asked why &#8220;my-site_official.com&#8221; kept failing at checkout. The hyphen was fine. The underscore wasn&#8217;t. One stray character is enough to block a registration completely. DNS has followed the same character rules since the 1980s. This guide covers every character a domain name can and can&#8217;t use.<\/p>\n\n\n\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-black ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Which_Characters_Are_Not_Allowed_in_Domain_Names\" >Which Characters Are Not Allowed in Domain Names?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#What_Characters_Are_Allowed_in_a_Domain_Name\" >What Characters Are Allowed in a Domain Name?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Letters_Numbers_and_Hyphens\" >Letters, Numbers, and Hyphens<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Can_Domain_Names_Contain_Spaces\" >Can Domain Names Contain Spaces?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Can_Domain_Names_Contain_Underscores\" >Can Domain Names Contain Underscores?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Can_Domain_Names_Contain_Symbols_or_Special_Characters\" >Can Domain Names Contain Symbols or Special Characters?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Can_Domain_Names_Contain_Emojis\" >Can Domain Names Contain Emojis?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Domain_Name_Character_Restrictions_by_Length_and_Position\" >Domain Name Character Restrictions by Length and Position<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Why_These_Domain_Name_Naming_Rules_Exist_DNS_Naming_Conventions\" >Why These Domain Name Naming Rules Exist (DNS Naming Conventions)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Domain_Name_Registration_Rules_and_Character_Requirements\" >Domain Name Registration Rules and Character Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#What_Happens_With_an_Invalid_Domain_Name_Format\" >What Happens With an Invalid Domain Name Format?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#How_to_Check_If_a_Domain_Name_Format_Is_Valid\" >How to Check If a Domain Name Format Is Valid<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Valid_vs_Invalid_Domain_Name_Examples\" >Valid vs Invalid Domain Name Examples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Can_a_domain_name_start_with_a_number\" >Can a domain name start with a number?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Can_a_domain_name_start_or_end_with_a_hyphen\" >Can a domain name start or end with a hyphen?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Are_domain_names_case-sensitive\" >Are domain names case-sensitive?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Can_I_register_a_domain_name_with_accented_letters\" >Can I register a domain name with accented letters?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#Why_does_my_domain_registration_keep_getting_rejected\" >Why does my domain registration keep getting rejected?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/#References\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"h-which-characters-are-not-allowed-in-domain-names-0\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Which_Characters_Are_Not_Allowed_in_Domain_Names\"><\/span>Which Characters Are Not Allowed in Domain Names?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1-1024x576.webp\" alt=\"Which Characters Are Not Allowed in Domain Names?\" class=\"wp-image-2451\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-65-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Spaces, underscores, most symbols, and unencoded non-Latin characters are the main culprits. Here&#8217;s the full list.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spaces, in any position<\/li>\n\n\n\n<li>Underscores, inside the registered domain itself<\/li>\n\n\n\n<li>Symbols like <code>! @ # $ % ^ &amp; * ( ) =<\/code><\/li>\n\n\n\n<li>A period anywhere except between labels<\/li>\n\n\n\n<li>Non-Latin characters, unless encoded through punycode<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These rules come from DNS, not any single registrar. Break one, and most systems reject the name instantly. No error code. No appeal. Just a different string, please.<\/p>\n\n\n\n<h2 id=\"h-what-characters-are-allowed-in-a-domain-name\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Characters_Are_Allowed_in_a_Domain_Name\"><\/span>What Characters Are Allowed in a Domain Name?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1-1024x576.webp\" alt=\"What Characters Are Allowed in a Domain Name?\" class=\"wp-image-2452\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-66-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 id=\"h-letters-numbers-and-hyphens\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Letters_Numbers_and_Hyphens\"><\/span>Letters, Numbers, and Hyphens<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Only three character types pass validation: letters, numbers, and hyphens. Nothing else clears the check.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Letters: upper or lowercase, treated identically<\/li>\n\n\n\n<li>Numbers: 0 through 9, alone or mixed in<\/li>\n\n\n\n<li>Hyphens: fine mid-string, never first or last<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is the LDH rule, short for letters-digits-hyphens. It governs every standard label, everywhere. Stay inside these three types, and a name always passes.<\/p>\n\n\n\n<h2 id=\"h-can-domain-names-contain-spaces\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_Domain_Names_Contain_Spaces\"><\/span>Can Domain Names Contain Spaces?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1-1024x576.webp\" alt=\"Can Domain Names Contain Spaces?\" class=\"wp-image-2453\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-67-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">No, a domain name can never contain a space. That rule has zero exceptions.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DNS reads a domain as one unbroken string<\/li>\n\n\n\n<li>A space splits that string into two unreadable pieces<\/li>\n\n\n\n<li>&#8220;my site.com&#8221; fails before it ever reaches a server<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">That&#8217;s a protocol limit, not a registrar preference. No workaround exists.<\/p>\n\n\n\n<h2 id=\"h-can-domain-names-contain-underscores\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_Domain_Names_Contain_Underscores\"><\/span>Can Domain Names Contain Underscores?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1-1024x576.webp\" alt=\"Can Domain Names Contain Underscores?\" class=\"wp-image-2454\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-68-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Not for registration, though the real answer runs a bit deeper.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Where It Shows Up<\/th><th class=\"has-text-align-left\" data-align=\"left\">Underscore Allowed?<\/th><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Registered domain name (example.com)<\/td><td class=\"has-text-align-left\" data-align=\"left\">No, blocked by RFC 1035<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">TXT records<\/td><td class=\"has-text-align-left\" data-align=\"left\">Yes, commonly used<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">SRV records<\/td><td class=\"has-text-align-left\" data-align=\"left\">Yes, by design<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">CNAME records<\/td><td class=\"has-text-align-left\" data-align=\"left\">Yes, in many setups<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">A, AAAA, and MX records<\/td><td class=\"has-text-align-left\" data-align=\"left\">No, rejected by most DNS servers<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The restriction applies to the domain you register. It doesn&#8217;t touch every record type underneath it. Worth knowing before a confusing support call.<\/p>\n\n\n\n<h2 id=\"h-can-domain-names-contain-symbols-or-special-characters\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_Domain_Names_Contain_Symbols_or_Special_Characters\"><\/span>Can Domain Names Contain Symbols or Special Characters?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1-1024x576.webp\" alt=\"Can Domain Names Contain Symbols or Special Characters?\" class=\"wp-image-2455\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-69-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">No registrar accepts symbols such as <code>!<\/code>, <code>@<\/code>, <code>#<\/code>, or <code>%<\/code>.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Blocked Symbol<\/th><th class=\"has-text-align-left\" data-align=\"left\">Why It Fails<\/th><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">! (exclamation)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Reserved for shell and system syntax<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">@ (at sign)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Reserved for email address structure<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"># (hash)<\/td><td class=\"has-text-align-left\" data-align=\"left\">Reserved for URL fragment identifiers<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">$ % ^ &amp; *<\/td><td class=\"has-text-align-left\" data-align=\"left\">No defined DNS function; blocked outright<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">( ) [ ]<\/td><td class=\"has-text-align-left\" data-align=\"left\">Reserved for grouping in other syntaxes<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\/ \\<\/td><td class=\"has-text-align-left\" data-align=\"left\">Reserved as a path separator<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Each symbol already works a job elsewhere. Think URLs, email addresses, browser syntax. Letting it into a domain name breaks that other function.<\/p>\n\n\n\n<h2 id=\"h-can-domain-names-contain-emojis\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_Domain_Names_Contain_Emojis\"><\/span>Can Domain Names Contain Emojis?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1-1024x576.webp\" alt=\"Can Domain Names Contain Emojis?\" class=\"wp-image-2456\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-70-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Technically yes, but almost no registrar actually allows it in practice.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Emoji domains route through punycode, the system used for accents too<\/li>\n\n\n\n<li>A smiley face converts into a string starting with &#8220;xn--&#8220;<\/li>\n\n\n\n<li>The .ws extension experimented with emoji registration years ago<\/li>\n\n\n\n<li>Most registrars block it; most browsers show raw punycode instead<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A short, pronounceable name still beats an emoji nobody can type.<\/p>\n\n\n\n<h2 id=\"h-domain-name-character-restrictions-by-length-and-position\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Domain_Name_Character_Restrictions_by_Length_and_Position\"><\/span>Domain Name Character Restrictions by Length and Position<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1-1024x576.webp\" alt=\"Domain Name Character Restrictions by Length and Position\" class=\"wp-image-2457\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-71-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Each label runs from 1 to 63 characters, with 253 total.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Each label, the part between dots, caps at 63 characters<\/li>\n\n\n\n<li>The full domain caps at 253 characters, dots included<\/li>\n\n\n\n<li>Hyphens can&#8217;t open or close a label<\/li>\n\n\n\n<li>Case doesn&#8217;t matter; MYSITE.com and mysite.com resolve the same<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Most real names stay far under these ceilings anyway. The character set is the real constraint, not the length.<\/p>\n\n\n\n<h2 id=\"h-why-these-domain-name-naming-rules-exist-dns-naming-conventions\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_These_Domain_Name_Naming_Rules_Exist_DNS_Naming_Conventions\"><\/span>Why These Domain Name Naming Rules Exist (DNS Naming Conventions)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1-1024x576.webp\" alt=\"Why These Domain Name Naming Rules Exist (DNS Naming Conventions)\" class=\"wp-image-2458\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-72-1.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These rules exist because DNS was built in 1983 around a narrow character set.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RFC 1035 defined domain syntax before Unicode or emoji existed<\/li>\n\n\n\n<li>A small rule set meant every server could parse names identically<\/li>\n\n\n\n<li>Internationalized names arrived later, through a separate encoding layer<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Changing the encoding was easier than rewriting the original rule. For the bigger picture of how names get resolved at all, our <a href=\"https:\/\/www.mostdomain.com\/blog\/domain-name-system-overview\/\" target=\"_blank\" rel=\"noopener\">Domain Name System overview<\/a> breaks down the full lookup process.<\/p>\n\n\n\n<h2 id=\"h-domain-name-registration-rules-and-character-requirements\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Domain_Name_Registration_Rules_and_Character_Requirements\"><\/span>Domain Name Registration Rules and Character Requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3-1024x576.webp\" alt=\"Domain Name Registration Rules and Character Requirements\" class=\"wp-image-2459\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-73-3.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Registration adds a few extra character checks on top of the base DNS syntax.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Registrars auto-lowercase every submission before validation runs<\/li>\n\n\n\n<li>Reserved words, like a registry&#8217;s own brand name, stay blocked<\/li>\n\n\n\n<li>Some new gTLDs allow limited non-Latin characters through IDN<\/li>\n\n\n\n<li>ccTLDs occasionally add their own character exceptions, such as accents<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These additions sit on top of the universal rules above; they don&#8217;t replace them. Extension choice matters here too, since some <a href=\"https:\/\/www.mostdomain.com\/blog\/what-is-a-tld\/\" target=\"_blank\" rel=\"noopener\">TLDs<\/a> carry their own character policy. For the full eligibility and policy picture beyond characters, see our <a href=\"https:\/\/www.mostdomain.com\/blog\/domain-registration-rules-and-restrictions\/\" target=\"_blank\" rel=\"noopener\">complete guide to domain registration rules and restrictions<\/a>.<\/p>\n\n\n\n<h2 id=\"h-what-happens-with-an-invalid-domain-name-format\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Happens_With_an_Invalid_Domain_Name_Format\"><\/span>What Happens With an Invalid Domain Name Format?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3-1024x576.webp\" alt=\"What Happens With an Invalid Domain Name Format?\" class=\"wp-image-2460\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-74-3.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The registrar blocks registration before payment, instantly, every single time.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No partial registration and no &#8220;fix it later&#8221; option exists<\/li>\n\n\n\n<li>The system checks the string against character rules first<\/li>\n\n\n\n<li>Fail that check, and the field simply won&#8217;t submit<\/li>\n\n\n\n<li>Most registrars return a short &#8220;invalid format&#8221; message right away<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-how-to-check-if-a-domain-name-format-is-valid\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Check_If_a_Domain_Name_Format_Is_Valid\"><\/span>How to Check If a Domain Name Format Is Valid<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2-1024x576.webp\" alt=\"How to Check If a Domain Name Format Is Valid\" class=\"wp-image-2461\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-75-2.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Run a quick availability search, since most tools flag bad characters automatically.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Search the name directly through an accredited registrar<\/li>\n\n\n\n<li>Run a <a href=\"https:\/\/www.mostdomain.com\/blog\/whois-lookup\/\" target=\"_blank\" rel=\"noopener\">WHOIS lookup<\/a> to confirm a name&#8217;s current status<\/li>\n\n\n\n<li>Strip spaces, underscores, and symbols before testing a new idea<\/li>\n\n\n\n<li>Follow our walkthrough on <a href=\"https:\/\/www.mostdomain.com\/blog\/how-to-check-if-a-domain-name-is-available\/\" target=\"_blank\" rel=\"noopener\">how to check if a domain name is available<\/a> for the full process<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-valid-vs-invalid-domain-name-examples\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Valid_vs_Invalid_Domain_Name_Examples\"><\/span>Valid vs Invalid Domain Name Examples<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3-1024x576.webp\" alt=\"Valid vs Invalid Domain Name Examples\" class=\"wp-image-2462\" srcset=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3-1024x576.webp 1024w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3-300x169.webp 300w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3-768x432.webp 768w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3-1536x864.webp 1536w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3-1140x641.webp 1140w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3-750x421.webp 750w, https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/mostdomaincom-76-3.webp 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A quick side-by-side usually clears up the remaining doubts.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Attempted Name<\/th><th class=\"has-text-align-left\" data-align=\"left\">Valid?<\/th><th class=\"has-text-align-left\" data-align=\"left\">Why<\/th><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">my-site.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">Valid<\/td><td class=\"has-text-align-left\" data-align=\"left\">Letters plus one mid-string hyphen<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">my_site.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">Invalid<\/td><td class=\"has-text-align-left\" data-align=\"left\">Underscore isn&#8217;t permitted<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">my site.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">Invalid<\/td><td class=\"has-text-align-left\" data-align=\"left\">Space breaks the DNS string<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">my-site!.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">Invalid<\/td><td class=\"has-text-align-left\" data-align=\"left\">Symbol isn&#8217;t permitted<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">-mysite.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">Invalid<\/td><td class=\"has-text-align-left\" data-align=\"left\">Leading hyphen isn&#8217;t permitted<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">mysite123.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">Valid<\/td><td class=\"has-text-align-left\" data-align=\"left\">Letters and numbers, no blocked characters<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">caf\u00e9.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">Needs punycode<\/td><td class=\"has-text-align-left\" data-align=\"left\">Registers as xn--caf-dma.com<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div class=\"mdm-df-wrap mdm-df-mcar\" data-mdm-df=\"{&quot;atts&quot;:{&quot;min_price&quot;:&quot;&quot;,&quot;max_price&quot;:&quot;&quot;,&quot;price_min&quot;:&quot;&quot;,&quot;price_max&quot;:&quot;&quot;,&quot;search&quot;:&quot;&quot;,&quot;q&quot;:&quot;&quot;,&quot;category&quot;:&quot;&quot;,&quot;category_id&quot;:&quot;&quot;,&quot;extension&quot;:&quot;&quot;,&quot;tld&quot;:&quot;&quot;,&quot;tld_id&quot;:&quot;&quot;,&quot;language&quot;:&quot;&quot;,&quot;language_id&quot;:&quot;&quot;,&quot;registrar_id&quot;:&quot;&quot;,&quot;account_id&quot;:&quot;&quot;,&quot;da_min&quot;:&quot;&quot;,&quot;da_max&quot;:&quot;&quot;,&quot;dr_min&quot;:&quot;&quot;,&quot;dr_max&quot;:&quot;&quot;,&quot;pa_min&quot;:&quot;&quot;,&quot;pa_max&quot;:&quot;&quot;,&quot;rd_min&quot;:&quot;&quot;,&quot;rd_max&quot;:&quot;&quot;,&quot;age_min&quot;:&quot;&quot;,&quot;age_max&quot;:&quot;&quot;,&quot;indexed&quot;:&quot;&quot;,&quot;promotion&quot;:&quot;flash_sale&quot;,&quot;sort&quot;:&quot;priority&quot;,&quot;limit&quot;:12,&quot;per_page&quot;:6,&quot;rows&quot;:2,&quot;page&quot;:1,&quot;active&quot;:&quot;true&quot;,&quot;inventory&quot;:&quot;false&quot;,&quot;columns&quot;:3,&quot;columns_tablet&quot;:2,&quot;columns_mobile&quot;:1,&quot;gap&quot;:&quot;&quot;,&quot;accent&quot;:&quot;&quot;,&quot;mobile_carousel&quot;:&quot;true&quot;,&quot;show_metrics&quot;:&quot;false&quot;,&quot;fields&quot;:&quot;da,pa,dr&quot;,&quot;show_filter&quot;:&quot;false&quot;,&quot;show_count&quot;:&quot;false&quot;,&quot;pagination&quot;:&quot;false&quot;,&quot;load_more&quot;:&quot;&quot;,&quot;currency&quot;:&quot;$&quot;,&quot;currency_position&quot;:&quot;prefix&quot;,&quot;price_decimals&quot;:0,&quot;buy_url&quot;:&quot;https:\\\/\\\/www.mostdomain.com\\\/domain\\\/{domain_code}&quot;,&quot;buy_text&quot;:&quot;View details&quot;,&quot;buy_target&quot;:&quot;_blank&quot;,&quot;more_text&quot;:&quot;Load more&quot;,&quot;empty_text&quot;:&quot;No domains match your filters.&quot;,&quot;count_text&quot;:&quot;Showing %s domains&quot;,&quot;search_placeholder&quot;:&quot;Search domain name, niche, keyword\\u2026&quot;},&quot;nonce&quot;:&quot;281486cd32&quot;,&quot;ajax&quot;:&quot;https:\\\/\\\/www.mostdomain.com\\\/blog\\\/wp-admin\\\/admin-ajax.php&quot;}\"><div class=\"mdm-df-results\"><div class=\"mdm-df-grid\" style=\"--mdm-df-cols:3;--mdm-df-cols-t:2;--mdm-df-cols-m:1;\"><article class=\"mdm-df-card is-flash has-mid\"><div class=\"mdm-df-card-head\"><span class=\"mdm-df-name\"><span class=\"mdm-df-sld\">therapyhealthstudio<\/span><span class=\"mdm-df-tld\">.com<\/span><span class=\"mdm-df-tip\">therapyhealthstudio.com<\/span><\/span><span class=\"mdm-df-tag\">Health &amp; Wellness<\/span><\/div><div class=\"mdm-df-fields mdm-df-fields--grid\"><div class=\"mdm-df-field-row\"><span class=\"k\">DA<\/span><span class=\"v\">14<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">PA<\/span><span class=\"v\">27<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">DR<\/span><span class=\"v\">2<\/span><\/div><\/div><div class=\"mdm-df-card-foot\"><span class=\"mdm-df-price-wrap\"><span class=\"mdm-df-price\">$ 570<\/span><span class=\"mdm-df-price-original\">$ 1,750<\/span><\/span><a class=\"mdm-df-buy\" href=\"https:\/\/www.mostdomain.com\/domain\/TTHECO2644\" target=\"_blank\" rel=\"noopener nofollow\">View details<\/a><\/div><span class=\"mdm-df-badge\">Flash Sale<\/span><\/article><article class=\"mdm-df-card is-flash has-mid\"><div class=\"mdm-df-card-head\"><span class=\"mdm-df-name\"><span class=\"mdm-df-sld\">lentiledecontact<\/span><span class=\"mdm-df-tld\">.net<\/span><span class=\"mdm-df-tip\">lentiledecontact.net<\/span><\/span><span class=\"mdm-df-tag\">Health &amp; Wellness<\/span><\/div><div class=\"mdm-df-fields mdm-df-fields--grid\"><div class=\"mdm-df-field-row\"><span class=\"k\">DA<\/span><span class=\"v\">11<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">PA<\/span><span class=\"v\">35<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">DR<\/span><span class=\"v\">0<\/span><\/div><\/div><div class=\"mdm-df-card-foot\"><span class=\"mdm-df-price-wrap\"><span class=\"mdm-df-price\">$ 1,600<\/span><span class=\"mdm-df-price-original\">$ 1,650<\/span><\/span><a class=\"mdm-df-buy\" href=\"https:\/\/www.mostdomain.com\/domain\/LLENNE5696\" target=\"_blank\" rel=\"noopener nofollow\">View details<\/a><\/div><span class=\"mdm-df-badge\">Flash Sale<\/span><\/article><article class=\"mdm-df-card is-flash has-mid\"><div class=\"mdm-df-card-head\"><span class=\"mdm-df-name\"><span class=\"mdm-df-sld\">eastwoodapts<\/span><span class=\"mdm-df-tld\">.org<\/span><span class=\"mdm-df-tip\">eastwoodapts.org<\/span><\/span><span class=\"mdm-df-tag\">Services<\/span><\/div><div class=\"mdm-df-fields mdm-df-fields--grid\"><div class=\"mdm-df-field-row\"><span class=\"k\">DA<\/span><span class=\"v\">7<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">PA<\/span><span class=\"v\">26<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">DR<\/span><span class=\"v\">0<\/span><\/div><\/div><div class=\"mdm-df-card-foot\"><span class=\"mdm-df-price-wrap\"><span class=\"mdm-df-price\">$ 1,260<\/span><span class=\"mdm-df-price-original\">$ 1,550<\/span><\/span><a class=\"mdm-df-buy\" href=\"https:\/\/www.mostdomain.com\/domain\/EEASOR4416\" target=\"_blank\" rel=\"noopener nofollow\">View details<\/a><\/div><span class=\"mdm-df-badge\">Flash Sale<\/span><\/article><article class=\"mdm-df-card is-flash has-mid\"><div class=\"mdm-df-card-head\"><span class=\"mdm-df-name\"><span class=\"mdm-df-sld\">bloomwithbubs<\/span><span class=\"mdm-df-tld\">.com<\/span><span class=\"mdm-df-tip\">bloomwithbubs.com<\/span><\/span><span class=\"mdm-df-tag\">Media<\/span><\/div><div class=\"mdm-df-fields mdm-df-fields--grid\"><div class=\"mdm-df-field-row\"><span class=\"k\">DA<\/span><span class=\"v\">4<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">PA<\/span><span class=\"v\">17<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">DR<\/span><span class=\"v\">0<\/span><\/div><\/div><div class=\"mdm-df-card-foot\"><span class=\"mdm-df-price-wrap\"><span class=\"mdm-df-price\">$ 1,100<\/span><span class=\"mdm-df-price-original\">$ 1,200<\/span><\/span><a class=\"mdm-df-buy\" href=\"https:\/\/www.mostdomain.com\/domain\/BBLOCO5561\" target=\"_blank\" rel=\"noopener nofollow\">View details<\/a><\/div><span class=\"mdm-df-badge\">Flash Sale<\/span><\/article><article class=\"mdm-df-card is-flash has-mid\"><div class=\"mdm-df-card-head\"><span class=\"mdm-df-name\"><span class=\"mdm-df-sld\">econoflash<\/span><span class=\"mdm-df-tld\">.com<\/span><span class=\"mdm-df-tip\">econoflash.com<\/span><\/span><span class=\"mdm-df-tag\">E-commerce<\/span><\/div><div class=\"mdm-df-fields mdm-df-fields--grid\"><div class=\"mdm-df-field-row\"><span class=\"k\">DA<\/span><span class=\"v\">14<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">PA<\/span><span class=\"v\">23<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">DR<\/span><span class=\"v\">0<\/span><\/div><\/div><div class=\"mdm-df-card-foot\"><span class=\"mdm-df-price-wrap\"><span class=\"mdm-df-price\">$ 1,250<\/span><span class=\"mdm-df-price-original\">$ 1,300<\/span><\/span><a class=\"mdm-df-buy\" href=\"https:\/\/www.mostdomain.com\/domain\/EECOCO5677\" target=\"_blank\" rel=\"noopener nofollow\">View details<\/a><\/div><span class=\"mdm-df-badge\">Flash Sale<\/span><\/article><article class=\"mdm-df-card is-flash has-mid\"><div class=\"mdm-df-card-head\"><span class=\"mdm-df-name\"><span class=\"mdm-df-sld\">bppolofhs<\/span><span class=\"mdm-df-tld\">.net<\/span><span class=\"mdm-df-tip\">bppolofhs.net<\/span><\/span><span class=\"mdm-df-tag\">Services<\/span><\/div><div class=\"mdm-df-fields mdm-df-fields--grid\"><div class=\"mdm-df-field-row\"><span class=\"k\">DA<\/span><span class=\"v\">4<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">PA<\/span><span class=\"v\">24<\/span><\/div><div class=\"mdm-df-field-row\"><span class=\"k\">DR<\/span><span class=\"v\">0<\/span><\/div><\/div><div class=\"mdm-df-card-foot\"><span class=\"mdm-df-price-wrap\"><span class=\"mdm-df-price\">$ 500<\/span><span class=\"mdm-df-price-original\">$ 1,600<\/span><\/span><a class=\"mdm-df-buy\" href=\"https:\/\/www.mostdomain.com\/domain\/BBPPNE9641\" target=\"_blank\" rel=\"noopener nofollow\">View details<\/a><\/div><span class=\"mdm-df-badge\">Flash Sale<\/span><\/article><\/div><\/div><\/div>\n\n\n\n<h2 id=\"h-faq\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 id=\"h-can-a-domain-name-start-with-a-number\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_a_domain_name_start_with_a_number\"><\/span>Can a domain name start with a number?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Numbers can open, close, or fill an entire label freely.<\/p>\n\n\n\n<h3 id=\"h-can-a-domain-name-start-or-end-with-a-hyphen\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_a_domain_name_start_or_end_with_a_hyphen\"><\/span>Can a domain name start or end with a hyphen?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Hyphens are blocked from the first and last position.<\/p>\n\n\n\n<h3 id=\"h-are-domain-names-case-sensitive\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Are_domain_names_case-sensitive\"><\/span>Are domain names case-sensitive?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Uppercase and lowercase letters always resolve the identical address.<\/p>\n\n\n\n<h3 id=\"h-can-i-register-a-domain-name-with-accented-letters\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_I_register_a_domain_name_with_accented_letters\"><\/span>Can I register a domain name with accented letters?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Only through punycode encoding, and browser support still varies.<\/p>\n\n\n\n<h3 id=\"h-why-does-my-domain-registration-keep-getting-rejected\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_does_my_domain_registration_keep_getting_rejected\"><\/span>Why does my domain registration keep getting rejected?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Usually a blocked character. Check first for spaces, underscores, or symbols.<\/p>\n\n\n\n<h2 id=\"h-references\" class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.rfc-editor.org\/info\/rfc1035\/\" data-type=\"link\" data-id=\"https:\/\/www.rfc-editor.org\/info\/rfc1035\/\">IETF<\/a>, RFC 1035: Domain Names &#8211; Implementation and Specification<\/li>\n\n\n\n<li>SSL.com, Underscores Not Allowed in Domain Names<\/li>\n\n\n\n<li>101domain, Domain Name Rules: What&#8217;s Allowed in a Registration<\/li>\n\n\n\n<li>Infomaniak, Discover the Allowed Characters for a Domain Name<\/li>\n\n\n\n<li>IETF, RFC 2782: A DNS RR for Specifying the Location of Services<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Mostdomain &#8211; A client once asked why &#8220;my-site_official.com&#8221; kept failing at checkout. The hyphen was fine. The underscore wasn&#8217;t. One stray character is enough to block a registration completely. DNS has followed the same character rules since the 1980s. This guide covers every character a domain name can and can&#8217;t use. Which Characters Are Not [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":2450,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jnews-multi-image_gallery":[],"jnews_single_post":{"format":"standard"},"jnews_primary_category":[],"jnews_override_bookmark_settings":[],"jnews_override_counter":[],"footnotes":""},"categories":[6],"tags":[603],"class_list":["post-2445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-which-characters-are-not-allowed-in-domain-names"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Which Characters Are Not Allowed in Domain Names? &#8211; MostDomain<\/title>\n<meta name=\"description\" content=\"See which characters are not allowed in domain names, which ones are, and why DNS rules block spaces, symbols, and emojis\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which Characters Are Not Allowed in Domain Names?\" \/>\n<meta property=\"og:description\" content=\"See which characters are not allowed in domain names, which ones are, and why DNS rules block spaces, symbols, and emojis\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.mostdomain.com\/blog\/which-characters-are-not-allowed-in-domain-names\/\" \/>\n<meta property=\"og:site_name\" content=\"MostDomain\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/mostdomain\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-30T11:15:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-30T11:15:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.mostdomain.com\/blog\/wp-content\/uploads\/2026\/10\/588-Which-Characters-Are-Not-Allowed-in-Domain-Names_.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Ajay Khumar\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@mostdomainofc\" \/>\n<meta name=\"twitter:site\" content=\"@mostdomainofc\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ajay Khumar\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/which-characters-are-not-allowed-in-domain-names\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/which-characters-are-not-allowed-in-domain-names\\\/\"},\"author\":{\"name\":\"Ajay Khumar\",\"@id\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/#\\\/schema\\\/person\\\/dc8bbaca058990d2f58e9ff28d468c30\"},\"headline\":\"Which Characters Are Not Allowed in Domain Names?\",\"datePublished\":\"2026-10-30T11:15:53+00:00\",\"dateModified\":\"2026-10-30T11:15:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/which-characters-are-not-allowed-in-domain-names\\\/\"},\"wordCount\":1103,\"publisher\":{\"@id\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/which-characters-are-not-allowed-in-domain-names\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/588-Which-Characters-Are-Not-Allowed-in-Domain-Names_.webp\",\"keywords\":[\"Which Characters Are Not Allowed in Domain Names\"],\"articleSection\":[\"SEO\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/which-characters-are-not-allowed-in-domain-names\\\/\",\"url\":\"https:\\\/\\\/www.mostdomain.com\\\/blog\\\/which-characters-are-not-allowed-in-domain-names\\\/\",\"name\":\"Which Characters Are Not Allowed in Domain Names? 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