     IDN2(1)                    Libidn2 2.3.1.48-1925                    IDN2(1)
     User Commands                                                 User Commands

                                      July 2021

     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

                                        - 1 -          Formatted:  July 20, 2021

     IDN2(1)                    Libidn2 2.3.1.48-1925                    IDN2(1)
     User Commands                                                 User Commands

                                      July 2021

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

     COPYRIGHT
          Copyright c 2011-2021 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.

                                        - 2 -          Formatted:  July 20, 2021