IDN(1) User Commands IDN(1) (NAME) idn - (IDN) (SYNOPSIS) idn [OPTION]... [STRINGS]... (DESCRIPTION) (IDN) STRINGS . (libidn). (locale) . --debug . CHARSET . '-' ( '-foo') '--' : idn --quiet -a -- -foo . -h, --help -V, --version -s, --stringprep (profile) nameprep -d, --punycode-decode (Punycode) -e, --punycode-encode (Punycode) -a, --idna-to-ascii ACE IDNA ( ) -u, --idna-to-unicode ACE IDNA --allow-unassigned AllowUnassigned IDNA ( ) --usestd3asciirules UseSTD3ASCIIRules IDNA ( ) --no-tld TLD --idna-to-ascii --idna-to-unicode -n, --nfkc Unicode . NFKC -p, --profile=STRING stringprep stringprep: Nameprep iSCSI Nodeprep Resourceprep trace SASLprep --debug --quiet (AUTHOR) Simon Josefsson. (REPORTING BUGS) : help-libidn@gnu.org GNU Libidn: : (COPYRIGHT) (C) 2026 Simon Josefsson. GPLv3+: GPL : . . (SEE ALSO) idn Texinfo . info idn info idn . GNU Libidn 1.44 June 2026 IDN(1)