Network Utility

Punycode & IDN Domain Converter

Instantly translate Internationalized Domain Names (IDNs) between Unicode and DNS-compatible ASCII (xn--) with built-in homograph spoofing detection.

Enter Domain Name or URL (Unicode or Punycode xn--)100% Client-Side RFC 3492 Parser

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How Internationalized Domain Names (IDN) & Punycode Work

Under original internet RFC standards, domain labels were strictly constrained to the LDH subset (Letters, Digits, Hyphen). As the internet expanded globally, users required domain names in their native writing systems—including Arabic, Cyrillic, Chinese, Devanagari, Japanese, and accented European Latin characters.

Rather than completely overhauling the root DNS server architecture, the IETF developed IDNA (Internationalizing Domain Names in Applications) and Punycode (RFC 3492). Under this scheme, client software automatically translates Unicode domain strings into an ASCII string prefixed with xn-- before issuing DNS lookups.

Script / Language	Unicode Domain (IDN)	Punycode Encoding (DNS ACE)
German (Umlaut)	münchen.de	xn--mnchen-3ya.de
Chinese (Simplified)	中文.com	xn--fiq228c.com
Emoji Domain	❤️.ws	xn--qe8h.ws
Homograph Spoof (Cyrillic 'а')	аpple.com	xn--pple-43d.com

Frequently Asked Questions (FAQ)

Punycode (RFC 3492) is a specialized encoding syntax used to convert non-ASCII Unicode strings into ASCII characters (a-z, 0-9, hyphen) compatible with the Domain Name System (DNS). Because core internet DNS infrastructure historically only supports ASCII characters, Punycode enables global domain names like 'münchen.de' to be resolved as 'xn--mnchen-3ya.de'.

Diagnostic Platform