JKZ NETWORK
JKZ NETWORK
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Free IDN Punycode Converter

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Convert internationalized Unicode domains to Punycode and back for DNS configuration and browser compatibility.

What is Punycode and IDN?

An Internationalized Domain Name (IDN) is a domain name that contains non-ASCII characters, such as accents, Cyrillic, Chinese, or Arabic characters. Because the Domain Name System (DNS) historically only supports basic ASCII characters, IDNs must be translated into an ASCII-compatible format. **Punycode** is the encoding syntax used to translate Unicode strings into an ASCII format starting with the prefix `xn--`.

Why Convert Between Unicode and Punycode?

  • DNS Setup: Domain registrars and nameservers require Punycode format (e.g. `xn--mase-qsa.com`) when setting up DNS records like A, MX, or CNAME.
  • Compatibility: Ensure email servers and legacy applications route traffic correctly to international domains.
  • Security Audits: Detect IDN homograph attacks where lookalike Unicode characters are used for phishing schemes.

How Punycode Encoding Works

Punycode translates Unicode strings into ASCII by stripping special characters, appending them at the end, and adding the `xn--` prefix. For example, `mañana.com` becomes `xn--maana-pta.com`. This ensures domain routing remains stable globally.

Details - FAQ

Punycode translates Unicode international domain names (IDN) into an ASCII-compatible format starting with "xn--" so they can resolve correctly through standard DNS systems.

It is a phishing technique where attackers register domains using lookalike characters from different alphabets (e.g., Cyrillic "а" instead of Latin "a") to trick users. Punycode reveals the actual registry name.

The tool converts domain names. If you enter a full URL, make sure to parse and convert only the domain host to prevent protocol conversion issues.

Yes. Punycode is an RFC-standardized translation syntax (RFC 3492). The conversion occurs locally in your browser with no network transmission.

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