libidn2: libidn2 (GNU Internationalized Domain Name library version 2) libidn2: libidn2: GNU Libidn is an implementation of the Stringprep, Punycode and IDNA libidn2: specifications defined by the IETF Internationalized Domain Names libidn2: (IDN) working group, used for internationalized domain names. libidn2: libidn2: libidn2: libidn2: libidn2: libidn2: