idn2 man page

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

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.

All input 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

Prints help and exits.

-V, --version

Prints version and exits.

-d, --decode

Decode an ACE name according to IDNA2008.

-l, --lookup

Encode to ACE according to IDNA2008 (the default).

-r, --register

Registers a label.

-T, --tr46t

Enable TR#46 transitional processing.

-N, --tr46nt

Enable TR#46 non-transitional processing (default).

--no-tr46

Disable TR#46 processing.

--usestd3asciirules

Enable STD3 ASCII rules.

--debug

Prints debugging information.

--quiet

Silent operation.

Written by Simon Josefsson.

Report bugs to the gitlab issue tracker of the project https://gitlab.com/libidn/libidn2/issues.