Maintained by: NLnet Labs

About Unbound

Unbound is a validating, recursive, and caching DNS resolver.

The C implementation of Unbound is developed and maintained by NLnet Labs. It is based on ideas and algorithms taken from a java prototype developed by Verisign labs, Nominet, Kirei and ep.net.

Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible.

The source code is under a BSD License.

Download

The latest source code tarball is available for download.

Bugs

Report bugs using bugzilla here.

Mailing List

You can subscribe to the unbound users mailing list here.

Browse the archives of unbound-users.

Maintenance and Support

Unbound is being maintained by NLnet Labs, a not for profit, public benefit foundation. Problems can be reported through the bugzilla webinterface. In the case we stop supporting the product we will announce such two years in advance.

Unbound is subject to NLnet Labs Security Patch Policy

Commercial support for Unbound is available from several organizations.

Code Repository

The repository for unbound is available at http://unbound.nlnetlabs.nl/svn/.

The development tree is located in trunk/.

User Groups

The Japan Unbound Users Group () provides documentation and support in Japanese.

News

Release 1.5.1

Mon Dec 8 17:00:14 CET 2014
Version 1.5.1 of unbound has been released.

Unbound CVE-2014-8602

Mon Dec 8 17:00:10 CET 2011
Unbound denial of service vulnerabilities from resolver chases of endless series of delegations CVE-2014-8602

Release 1.5.0

Tue Nov 18 09:37:14 CET 2014
Version 1.5.0 of unbound has been released.

Release 1.4.22

Wed Mar 12 13:47:14 CET 2014
Version 1.4.22 of unbound has been released.

Unbound in FreeBSD 10

Fri Sep 20 16:14:42 CEST 2013
FreeBSD announced that Unbound and LNDS will replace BIND as the system's DNS resolver