{"id":3431,"date":"2016-09-29T11:10:26","date_gmt":"2016-09-29T10:10:26","guid":{"rendered":"https:\/\/www.uk-cheapest.co.uk\/support\/?p=3431"},"modified":"2026-08-14T18:58:27","modified_gmt":"2026-08-14T17:58:27","slug":"which-characters-can-i-use-in-a-domain-name-address","status":"publish","type":"post","link":"https:\/\/www.uk-cheapest.co.uk\/support\/which-characters-can-i-use-in-a-domain-name-address\/","title":{"rendered":"Which Characters Can I Use in a Domain Name?"},"content":{"rendered":"\n<div class=\"ukc-organic-guide\">\n  <section class=\"ukc-organic-hero\" aria-labelledby=\"domain-characters-answer\">\n    <p class=\"ukc-organic-kicker\">Letters, numbers and hyphens are the safe default<\/p>\n    <h2 id=\"domain-characters-answer\">A standard domain label can use letters a to z, numbers 0 to 9 and hyphens, but it cannot contain spaces or ordinary punctuation<\/h2>\n    <p class=\"ukc-organic-lead\"><strong>A hyphen cannot normally be the first or last character.<\/strong> Internationalised domain names can display supported non-ASCII scripts, but the registry converts them to a technical ASCII form and each extension sets its own permitted characters and length rules.<\/p>\n    <div class=\"ukc-organic-actions\">\n      <a class=\"ukc-organic-button\" href=\"https:\/\/www.uk-cheapest.co.uk\/domain-names\/?ukc_ref=support_domain_characters\" data-ukc-organic-cta=\"top\" data-ukc-organic-destination=\"domain-search\">Test a Domain Name<\/a>\n      <a class=\"ukc-organic-text-link\" href=\"#character-examples\">See valid examples<\/a>\n    <\/div>\n    <div class=\"ukc-organic-facts\" aria-label=\"Domain character summary\">\n      <article><span>YES<\/span><strong>Letters and digits<\/strong><small>a-z and 0-9<\/small><\/article>\n      <article><span>YES<\/span><strong>Internal hyphens<\/strong><small>Not at either end<\/small><\/article>\n      <article><span>NO<\/span><strong>Spaces and @<\/strong><small>Not in the domain label<\/small><\/article>\n    <\/div>\n  <\/section>\n\n  <nav class=\"ukc-organic-nav\" aria-label=\"On this page\">\n    <strong>On this page<\/strong>\n    <a href=\"#character-examples\">Examples<\/a>\n    <a href=\"#domain-length\">Length<\/a>\n    <a href=\"#idn-domains\">International names<\/a>\n    <a href=\"#email-characters\">Email addresses<\/a>\n    <a href=\"#choose-readable-domain\">Naming checks<\/a>\n    <a href=\"#character-questions\">Questions<\/a>\n  <\/nav>\n\n  <aside class=\"ukc-organic-warning\"><strong>The old claim that every extension follows exactly the same rules is incorrect.<\/strong> DNS provides technical limits, while each registry can impose a narrower character set, minimum length, reserved-name list or internationalised-domain policy.<\/aside>\n\n  <h2 id=\"character-examples\">Which domain-name examples are valid?<\/h2>\n  <div class=\"ukc-organic-table-wrap\" role=\"region\" aria-label=\"Domain character examples\" tabindex=\"0\">\n    <table class=\"ukc-organic-table\">\n      <thead><tr><th scope=\"col\">Example label<\/th><th scope=\"col\">Normally valid?<\/th><th scope=\"col\">Reason<\/th><\/tr><\/thead>\n      <tbody>\n        <tr><th scope=\"row\">example<\/th><td>Yes<\/td><td>Uses letters only<\/td><\/tr>\n        <tr><th scope=\"row\">example24<\/th><td>Yes<\/td><td>Letters and digits are permitted<\/td><\/tr>\n        <tr><th scope=\"row\">my-example<\/th><td>Yes<\/td><td>The hyphen is inside the label<\/td><\/tr>\n        <tr><th scope=\"row\">-example<\/th><td>No<\/td><td>A normal registered label cannot start with a hyphen<\/td><\/tr>\n        <tr><th scope=\"row\">example-<\/th><td>No<\/td><td>A normal registered label cannot end with a hyphen<\/td><\/tr>\n        <tr><th scope=\"row\">my example<\/th><td>No<\/td><td>Spaces are not domain-label characters<\/td><\/tr>\n        <tr><th scope=\"row\">sales@example<\/th><td>No<\/td><td>@ separates the local part from the domain in an email address; it is not part of the domain<\/td><\/tr>\n        <tr><th scope=\"row\">example!<\/th><td>No<\/td><td>Ordinary punctuation such as !, &#038;, \/ and ? is not allowed in a registered ASCII label<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n  <aside class=\"ukc-organic-note\"><strong>Uppercase and lowercase do not create different DNS names.<\/strong> EXAMPLE.UK and example.uk resolve as the same domain even though a brand may choose a preferred visual style.<\/aside>\n\n  <h2 id=\"domain-length\">How long can a domain name be?<\/h2>\n  <div class=\"ukc-organic-grid two\">\n    <article class=\"ukc-organic-card\"><h3>One DNS label<\/h3><p>The technical limit for a single ASCII DNS label is 63 octets. The label is the part between dots, such as example in example.co.uk.<\/p><\/article>\n    <article class=\"ukc-organic-card\"><h3>The complete domain<\/h3><p>The full name has a larger DNS wire-format limit and is commonly treated as no more than 253 visible characters without a final root dot.<\/p><\/article>\n    <article class=\"ukc-organic-card\"><h3>The registry minimum<\/h3><p>There is no universal three-character minimum for every extension. A registry can set its own minimum and reserve otherwise valid short names.<\/p><\/article>\n    <article class=\"ukc-organic-card\"><h3>Internationalised names<\/h3><p>The converted ASCII form must fit the DNS limit, so the number of visible Unicode characters is not the only length test.<\/p><\/article>\n  <\/div>\n  <p>For customers, the practical target is much shorter. A concise name is easier to type, fit on printed material, read over the telephone and use in an email address.<\/p>\n\n  <h2 id=\"idn-domains\">Can a domain use accented, Japanese or other international characters?<\/h2>\n  <p>Some extensions support internationalised domain names, known as IDNs. The visible Unicode name is converted into an ASCII-compatible form called Punycode, which begins with <strong>xn--<\/strong>. Browsers can display the readable version when their safety and language rules permit it.<\/p>\n  <div class=\"ukc-organic-grid two\">\n    <article class=\"ukc-organic-card\"><h3>Extension support varies<\/h3><p>A script accepted by one registry may be unavailable under another. Search through the intended extension and check its current IDN table.<\/p><\/article>\n    <article class=\"ukc-organic-card\"><h3>Software support varies<\/h3><p>Browsers, forms, email apps and older systems can display or process the converted name differently. Test the full customer journey.<\/p><\/article>\n    <article class=\"ukc-organic-card\"><h3>Lookalike risk matters<\/h3><p>Characters from different scripts can look similar. Avoid a name that customers may mistake for a different brand or website.<\/p><\/article>\n    <article class=\"ukc-organic-card\"><h3>Register the practical companion<\/h3><p>Where appropriate, also secure an easy ASCII version and redirect it to the preferred site so customers have a reliable fallback.<\/p><\/article>\n  <\/div>\n  <p>ICANN explains the technical and policy background in its <a href=\"https:\/\/www.icann.org\/resources\/pages\/idn-2012-02-25-en\" rel=\"noopener\" data-ukc-organic-cta=\"source\" data-ukc-organic-destination=\"icann-idn\"><strong>internationalised domain name resource<\/strong><\/a>.<\/p>\n\n  <h2 id=\"email-characters\">Why do email addresses appear to allow more characters?<\/h2>\n  <p>An email address contains two different parts:<\/p>\n  <div class=\"ukc-organic-table-wrap\" role=\"region\" aria-label=\"Email address character parts\" tabindex=\"0\">\n    <table class=\"ukc-organic-table\">\n      <thead><tr><th scope=\"col\">Part<\/th><th scope=\"col\">Example<\/th><th scope=\"col\">Rule<\/th><\/tr><\/thead>\n      <tbody>\n        <tr><th scope=\"row\">Local part<\/th><td>sales in sales@example.uk<\/td><td>The mailbox system decides which supported characters can appear before @<\/td><\/tr>\n        <tr><th scope=\"row\">Separator<\/th><td>@<\/td><td>Separates the mailbox local part from the domain and cannot be inside the registered domain<\/td><\/tr>\n        <tr><th scope=\"row\">Domain<\/th><td>example.uk<\/td><td>Must follow the DNS and registry rules for its labels and extension<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n  <aside class=\"ukc-organic-note\"><strong>Keep business mailbox names simple even if the server permits more.<\/strong> Addresses such as hello@, sales@ and accounts@ are easier to dictate and less likely to fail in older forms than unusual punctuation.<\/aside>\n\n  <h2 id=\"choose-readable-domain\">What should you check beyond technical validity?<\/h2>\n  <ol class=\"ukc-organic-steps\">\n    <li><span>1<\/span><div><strong>Say it aloud<\/strong><p>Ask whether a customer can hear the name once and type it correctly without extra explanation.<\/p><\/div><\/li>\n    <li><span>2<\/span><div><strong>Check the hyphens and digits<\/strong><p>Decide whether people will know to type a hyphen, or whether a spoken number is written as a digit or word.<\/p><\/div><\/li>\n    <li><span>3<\/span><div><strong>Review neighbouring names<\/strong><p>Check likely misspellings, the matching .co.uk, .uk and .com, and any confusingly similar established business.<\/p><\/div><\/li>\n    <li><span>4<\/span><div><strong>Check rights and restrictions<\/strong><p>Availability does not grant rights to another party&#8217;s name, trade mark or reserved registry term.<\/p><\/div><\/li>\n    <li><span>5<\/span><div><strong>Test the full address<\/strong><p>Place the name after www and in sample email addresses to see whether it remains clear and manageable.<\/p><\/div><\/li>\n    <li><span>6<\/span><div><strong>Search the exact extension<\/strong><p>The registry&#8217;s availability response is the final practical character and reservation test for that order.<\/p><\/div><\/li>\n  <\/ol>\n\n  <h2 id=\"character-questions\">Domain character questions<\/h2>\n  <div class=\"ukc-organic-faq\">\n    <details open><summary>Can a domain name contain a space?<\/summary><p>No. A normal registered domain label cannot contain spaces. Use a hyphen if separation is essential, or combine the words.<\/p><\/details>\n    <details><summary>Can a domain name contain an underscore?<\/summary><p>Not as an ordinary website hostname label registered for people to use. DNS uses underscore-prefixed labels for technical records such as _dmarc and _sip, which are different from the registrable domain name.<\/p><\/details>\n    <details><summary>Can a domain start or end with a hyphen?<\/summary><p>A normal ASCII registration cannot. Internationalised names use a reserved converted prefix, so do not manually treat xn-- as an ordinary naming trick.<\/p><\/details>\n    <details><summary>Can I use an ampersand or apostrophe?<\/summary><p>Not in a standard ASCII domain label. Replace the symbol with a word, omit it or choose another clear variation.<\/p><\/details>\n    <details><summary>Are one-character and two-character names allowed?<\/summary><p>The technical DNS format can represent them, but the registry decides whether short labels can be newly registered and many are reserved or already taken. Search the exact extension.<\/p><\/details>\n    <details><summary>Does the extension count toward the 63-character label limit?<\/summary><p>No. The 63-octet limit applies to each individual label between dots. The whole domain also has its own larger DNS limit.<\/p><\/details>\n  <\/div>\n\n  <section class=\"ukc-organic-final\" aria-labelledby=\"domain-characters-final\">\n    <div><p class=\"ukc-organic-kicker\">Valid is not always memorable<\/p><h2 id=\"domain-characters-final\">Use the simplest permitted name that customers can read, type and trust<\/h2><p>Search the exact extension to confirm its current length, character, IDN and reserved-name rules before ordering.<\/p><\/div>\n    <div class=\"ukc-organic-final-actions\">\n      <a class=\"ukc-organic-button\" href=\"https:\/\/www.uk-cheapest.co.uk\/domain-names\/?ukc_ref=support_domain_characters\" data-ukc-organic-cta=\"final\" data-ukc-organic-destination=\"domain-search\">Test a Domain Name<\/a>\n      <a href=\"https:\/\/www.uk-cheapest.co.uk\/support\/choosing-the-right-domain-name\/\" data-ukc-organic-cta=\"choose\" data-ukc-organic-destination=\"naming-guide\">Choose a stronger name<\/a>\n    <\/div>\n  <\/section>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Letters, numbers and hyphens are the safe default A standard domain label can use letters a to z, numbers 0 to 9 and hyphens, but it cannot contain spaces or ordinary punctuation A hyphen cannot normally be the first or last character. Internationalised domain names can display supported non-ASCII scripts, but the registry converts them &#8230; <a title=\"Which Characters Can I Use in a Domain Name?\" class=\"read-more\" href=\"https:\/\/www.uk-cheapest.co.uk\/support\/which-characters-can-i-use-in-a-domain-name-address\/\" aria-label=\"Read more about Which Characters Can I Use in a Domain Name?\">Read more&#8230;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-3431","post","type-post","status-publish","format-standard","hentry","category-domain-names"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Which Characters Can I Use in a Domain Name? | UKC<\/title>\n<meta name=\"description\" content=\"See which letters, numbers, hyphens and international characters a domain can use, plus length limits, invalid examples and email-address differences.\" \/>\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.uk-cheapest.co.uk\/support\/which-characters-can-i-use-in-a-domain-name-address\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which Characters Can I Use in a Domain Name? 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