Punycode & Internationalized Domain (IDN) Studio
Convert Internationalized Domain Names (IDNs) with non-ASCII characters to standard Punycode (xn--...) under RFC 3492, and decode Punycode back to native Unicode.
DNS Label Resolution Breakdown
| Label Position | Native Unicode Script | ASCII DNS Punycode (ACE) | IDN Type |
|---|---|---|---|
| Label #1 | münchen | xn--mnchen-3ya | IDN (Non-ASCII) |
| Label #2 | de | de | Standard ASCII |
The Network Engineering Architecture of Punycode (RFC 3492 & IDNA 2008)
When the Internet Domain Name System (DNS) was established in the 1980s, hostnames were strictly limited to the Letters-Digits-Hyphen (LDH) ASCII subset. As the internet expanded globally, users in Germany, the Middle East, South Asia, China, and Russia required domain names in their native scripts (such as münchen.de or پاکستان.شبکہ).
xn--.xn--mnchen-3ya.de), no root server software had to be modified to enable global multilingual domains.Security: IDN Homograph Phishing Attacks
Because Unicode contains visually identical glyphs across different scripts (such as Latin a vs. Cyrillic а U+0430), malicious attackers register look-alike domains to deceive users:
paypal.com (All Latin characters)pаypаl.com (Using Cyrillic ‘а’)xn--pypal-4ve.comFrequently Asked Questions (FAQs)
How does Punycode convert emoji domains (like ❤️.ws)?+
Emoji characters reside in Unicode astral planes. Punycode calculates the numeric codepoint (e.g. U+2764 for ❤️) and encodes it as "xn--qe7h.ws".
Why do modern browsers sometimes show "xn--" in the address bar?+
Browsers show the raw "xn--" Punycode address as a security precaution when a domain contains mixed scripts (e.g. mixing Latin and Cyrillic letters) to alert the user of potential homograph phishing.
Can I register an IDN domain with my domain registrar directly in Unicode?+
Most modern registrars allow typing native Unicode names. If a registrar only accepts ASCII, paste the generated Punycode (xn--...) directly into the registration field.