idn
converts internationalized domain names
TLDR
Encode to Punycode
$ echo "münchen" | idn
Decode from Punycode$ echo "xn--mnchen-3ya" | idn -d
Convert domain$ idn [example.日本]
Use IDNA 2008$ idn --idna2008 [domain]
Quiet mode$ idn -q [domain]
SYNOPSIS
idn [options] [strings]
DESCRIPTION
idn converts internationalized domain names. It encodes Unicode domains to ASCII-compatible Punycode and decodes back.
The tool implements IDNA standards for domain name internationalization. It handles non-ASCII characters in domain names.
PARAMETERS
STRINGS
Strings to convert.-d, --decode
Decode from Punycode.-a, --ascii
Output ASCII only.--idna2008
Use IDNA 2008 standard.-q, --quiet
Quiet mode.--help
Display help information.
CAVEATS
Part of libidn. IDNA2003 vs IDNA2008 differences. Punycode prefix is xn--.
HISTORY
idn is part of GNU Libidn for internationalized domain name handling.