libidn: libidn (GNU Internationalized Domain Name library) libidn: libidn: GNU Libidn is an implementation of the Stringprep, Punycode and IDNA libidn: specifications defined by the IETF Internationalized Domain Names libidn: (IDN) working group, used for internationalized domain names. libidn: libidn: libidn: libidn: libidn: libidn: