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1 Introduction

Libidn2 is a free software implementation of IDNA2008, Punycode and Unicode TR46. Its purpose is to encode and decode internationalized domain names.

The library is a rewrite of the popular but legacy libidn library, and is backwards (API) compatible with it. See Converting from libidn for more information.

For technical reference, see:

Libidn2 uses GNU libunistring ( for Unicode processing and optionally GNU libiconv ( for character set conversion.

The library is dual-licensed under LGPLv3 or GPLv2, see the file COPYING for detailed information.