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.

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 1.4.6

Tue Aug 3 13:37:50 CEST 2010
Version 1.4.6 of unbound has been released.

Flavors of Unbound

Wed Jul 28 16:57:32 CEST 2010
Men and Mice have published an article on how to select between different flavors of Unbound compilation. This article will explain the technical di fferences of the possible flavors of Unbound and will give proposals under which type of DNS workload a specific flavor will perform best. The article will be kept upd ated when new versions of unbound are released.

Release 1.4.5

Tue Jun 15 09:15:50 CEST 2010
Version 1.4.5 of unbound has been released.

Release 1.4.4

Thu Apr 22 10:37:11 CEST 2010
Version 1.4.4 of unbound has been released.

Release 1.4.3

Tue Mar 11 14:35:48 CET 2010
Version 1.4.3 of unbound has been released. Crash fix on 64bit platforms.

Release 1.4.2

Tue Mar 9 09:29:08 CET 2010
Version 1.4.2 of unbound has been released

Stale keys and requery behaviour

Fri Feb 12 17:41:19 CET 2010
Statement regarding concerns about stale keys and Unbound beh avior

Release 1.4.1

Thu Dec 17 10:09:56 CET 2009
Version 1.4.1 of unbound has been released

Release 1.4.0

Thu Nov 26 12:34:55 CET 2009
Version 1.4.0 of unbound has been released

Release 1.3.4

Wed Oct 7 17:03:28 CEST 2009
Version 1.3.4 of unbound has been released

Unbound Commercial Support

Sat Oct 3 8 16:00:00 CEST 2009
In addition to NLnet Labs' commitment to maintain Unbound there are also various parties to offer Commercial Support for Unbound.

SURFnet uses Unbound

Tue Sep 8 17:25:34 CEST 2009
SURFnet announces that all SURFnet DNS (Domain Name System) resolvers now support DNSSEC. SURFnet chose Unbound as its resolver. SURFnet is one of the first networks in the Netherlands to support DNSSEC.

Release 1.3.3

Thu Aug 4 16:14:27 CEST 2009
Version 1.3.3 of unbound has been released

Release 1.3.2

Thu Jun 13 10:36:30 CEST 2009
Version 1.3.2 of unbound has been released

Release 1.3.1

Thu Jun 9 09:57:29 CEST 2009
Version 1.3.1 of unbound has been released

Release 1.3.0

Thu Jun 11 11:44:07 CEST 2009
Version 1.3.0 of unbound has been released. Python and Windows support. Bugfixes and other features.

RFI for Unbound Tech Support

Tue Apr 21 10:59:42 CEST 2009
NLnet Labs is seeking information about organizations that would be willing and able to provide first and second line support for Unbound and would like to know more about their ideas on organization and cooperation.