idn2 (1) - Linux Manuals

idn2: Libidn2 Internationalized Domain Names conversion tool


idn2 - Libidn2 Internationalized Domain Names conversion tool


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


idn2 tool converts DNS domains from UTF-8 to ASCII compatibile 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).
Disable TR#46 processing.
Enable STD3 ASCII rules.
Prints debugging information.
Silent operation.


Written by Simon Josefsson.

Reporting bugs

Report bugs to the gitlab issue tracker of the project