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GNU Libidn
Libidn is an implementation of the Stringprep (with the Nameprep and Kerberos 5 profiles), Punycode and IDNA specifications defined by +the IETF Internationalized Domain Names (IDN) working group, used for internationalized domain names. The library contains a generic Stringprep implementation (including Unicode 3.2 NFKC normalization, table mapping of characters, and Bidirectional Character handling), two Stringprep profiles; Nameprep (for IDN) and Kerberos5, as well as a Punycode and IDNA. This project was formerly known as 'libstringprep.'


User reference manual available from

Heckert gnu.small.png This is a GNU package:libidn


Download version 1.32 (stable)
released on 1 August 2015

Paid extension/consulting available from

VCS Checkout



LicenseVerified byVerified onNotes
GPLv3orlaterKelly Hopkins24 May 2010
LGPLv2.1orlaterKelly Hopkins24 May 2010
LGPLv2.1Kelly Hopkins24 May 2010

Leaders and contributors

Simon Josefsson Maintainer

Resources and communication

Audience Resource type URI
Bug Tracking E-mail
Developer VCS Repository Webview

Software prerequisites

This entry (in part or in whole) was last reviewed on 23 September 2015.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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