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 IDN2(1)                    Libidn2                    IDN2(1)
 User Commands                                                 User Commands

                                  July 2021

      idn2 - Libidn2 Internationalized Domain Names conversion tool

      idn2 [,OPTION/]... [,STRINGS/]...

      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

      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

      -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

           Disable TR46 processing


                                    - 1 -           Formatted:  May 24, 2022

 IDN2(1)                    Libidn2                    IDN2(1)
 User Commands                                                 User Commands

                                  July 2021

           Enable STD3 ASCII rules

           Disable A-label roundtrip for lookups

           Print debugging information

           Silent operation

      Written by Simon Josefsson, Tim Ruehsen.

      Report bugs to:
      Libidn2 home page: <>
      General help using GNU software: <>

      Copyright c 2011-2021 Simon Josefsson, Tim Ruehsen.  License GPLv3+:
      GNU GPL version 3 or later <>.
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.


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

           info idn2

      should give you access to the complete manual.

                                    - 2 -           Formatted:  May 24, 2022