Punycode to Hostname Converter - Free Online Tool
Punycode to Hostname Converter
Decode Any Punycode Hostname Back to Unicode
Understanding Punycode Decoding
Phishing Detection
Decode a suspicious xn-- domain to see its real Unicode form before deciding whether to trust it.
Reading DNS Records
DNS zone files and WHOIS records store internationalized domains in Punycode — decode them to read the real name.
Debugging
Verify a Punycode-encoded value in a config file or log actually decodes to the domain you expect.
Client-Side Only
All decoding happens locally in your browser using a full RFC 3492 implementation — no data is ever sent to a server.
Punycode and Homograph Awareness
Some Unicode characters look nearly identical to Latin letters (like Cyrillic "а" vs Latin "a"), which attackers have historically exploited to register lookalike domains — a technique called a homograph attack. Decoding a suspicious xn-- domain here reveals exactly which characters it contains, letting you spot inconsistencies (like a Cyrillic letter mixed into an otherwise English word) that aren't obvious from the rendered domain name alone.
Key Takeaways
- Full RFC 3492 Implementation: Implements the real bootstring decoding algorithm, not an approximation.
- Per-Label Decoding: Only labels with an xn-- prefix are decoded; plain ASCII labels pass through unchanged.
- Client-Side Only: All decoding happens locally in your browser — no data is ever sent to a server.