NAME

       idn2 - Libidn2 Internationalized Domain Names conversion tool

SYNOPSIS

       idn2 [OPTION]... [STRINGS]...

DESCRIPTION

       The idn2 tool converts DNS domains from UTF-8 to ASCII compatible encoding (ACE) form, as used in the DNS
       protocol. The encoding format is the Internationalized Domain Name (IDNA2008/TR46) format.

       Internationalized Domain Name (IDNA2008) convert STRINGS, or standard input.

       Command line interface to the Libidn2 implementation of IDNA2008.

       All strings are expected to be encoded in the locale charset.

       To  process  a string that starts with `-', for example `-foo', use `--' to signal the end of parameters,
       as in `idn2 --quiet -- -foo'.

       Mandatory arguments to long options are mandatory for short options too.

       -h, --help
              Print help and exit

       -V, --version
              Print version and exit

       -d, --decode
              Decode (punycode) domain name

       -l, --lookup
              Lookup domain name (default)

       -r, --register
              Register label

       -T, --tr46t
              Enable TR46 transitional processing

       -N, --tr46nt
              Enable TR46 non-transitional processing

       --no-tr46
              Disable TR46 processing

       --usestd3asciirules
              Enable STD3 ASCII rules

       --no-alabelroundtrip
              Disable A-label roundtrip for lookups

       --debug
              Print debugging information

       --quiet
              Silent operation

AUTHOR

       Written by Simon Josefsson, Tim Ruehsen.

REPORTING BUGS

       Report bugs to: help-libidn@gnu.org

       Report Debian bugs to: https://bugs.debian.org/
       Libidn2 home page: <https://www.gnu.org/software/libidn/#libidn2>
       General help using GNU software: <https://www.gnu.org/gethelp/>

       Packaged by Debian (2.3.8-2)
       Copyright © 2011-2025 Simon Josefsson, Tim Ruehsen.
       License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       idn(1)

       The full documentation for idn2 is maintained as a Texinfo manual.  If the info  and  idn2  programs  are
       properly installed at your site, the command

              info idn2

       should give you access to the complete manual.

Libidn2 2.3.8                                      March 2025                                            IDN2(1)