Internationalized Domain Names (IDN)
Internationalized Domain Names (IDN)
An Internationalized Domain Name (IDN) is a domain name that contains characters outside the traditional ASCII set (a–z, 0–9, and hyphens). IDNs allow domain names to be written in scripts such as Arabic, Chinese, Cyrillic, Devanagari, Hebrew, Japanese, Korean, and many others — as well as accented Latin characters used in languages like French, German, and Spanish.
How Do IDNs Work?
The Domain Name System (DNS) was originally designed to support only ASCII characters. To accommodate non-ASCII scripts, IDNs use a system called Punycode, which encodes Unicode characters into an ASCII-compatible format.
For example:
| Displayed Domain | Punycode Equivalent |
|---|---|
| münchen.de | xn–mnchen-3ya.de |
| 中文.com | xn–fiq228c.com |
| café.com | xn–caf-dma.com |
When a user types an IDN into their browser, the browser converts it to Punycode behind the scenes, resolves the DNS query, and displays the original Unicode domain in the address bar.
Benefits of IDNs
- Native language access — Users can type domain names in their own language and script, improving accessibility and reducing errors.
- Cultural relevance — A domain name in a local script resonates more strongly with the target audience than an ASCII transliteration.
- Market differentiation — IDNs help businesses stand out in non-English-speaking markets.
- Improved memorability — People remember domain names in their native language more easily.
Supported TLDs
Not all TLDs support IDN registrations. Support varies by registry:
- Many legacy TLDs (
.com,.net,.org) support IDN second-level domains. - Several ccTLDs support IDNs, particularly those serving non-Latin-script communities.
- Some new gTLDs are themselves written entirely in non-Latin scripts (e.g.,
.中文网).
Check the registry’s IDN policy for supported character sets before attempting to register.
How to Register an IDN
- Verify support — Confirm that the TLD you want supports IDN registrations and the specific script or characters you need.
- Search — Use the 10Corp domain search tool to search for your IDN. You may need to enter the domain in its Unicode form.
- Review the Punycode — During checkout, verify the Punycode representation to ensure it matches your intended domain.
- Complete registration — Provide your registrant details and finalize the purchase.
Important Considerations
- Email compatibility — Not all email systems fully support IDN email addresses. Test thoroughly before relying on IDN-based email.
- Browser support — All modern browsers support IDN display, but some older software may show the Punycode version instead.
- Phishing risks — Because some Unicode characters look similar to ASCII characters (homoglyphs), IDNs can be exploited for phishing. Registries and browsers have safeguards, but awareness is still important.
- SSL certificates — Ensure your SSL/TLS certificate supports the Punycode version of your domain.
Summary
Internationalized Domain Names make the internet more accessible to non-English speakers by allowing domain names in native scripts. If your audience primarily uses a non-Latin alphabet, an IDN can significantly improve reach and trust. Register your IDN through 10Corp after confirming TLD and character support.