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
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.
The latest source code tarball is available for
Report bugs using bugzilla here.
You can subscribe to the unbound users mailing list
Browse the archives
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.
The repository for unbound is available at http://unbound.nlnetlabs.nl/svn/.
The development tree is located in
The Japan Unbound Users Group
() provides documentation
and support in Japanese.
Thu Mar 21 12:56:14 CET 2013
Version 1.4.20 of unbound has been released.
Wed Dec 12 09:53:15 CET 2012
Version 1.4.19 of unbound has been released.
Thu Aug 2 09:44:25 CEST 2012
Version 1.4.18 of unbound has been released.
Thu May 24 10:39:25 CEST 2012
Version 1.4.17 of unbound has been released.
Workshop at Augsburger Linutage
Fri Feb 17 09:23:55 CET 2012
free workshop at Augsburger Linux Infotage by Carsten Strotmann, 24 March.
Thu Feb 2 10:14:12 CET 2012
Version 1.4.16 of unbound has been released.
Thu Jan 26 10:14:12 CET 2012
Version 1.4.15 of unbound has been released.
Mon Dec 19 12:19:16 CET 2011
Version 1.4.14 of unbound has been released.
Unbound VU#209659 CVE-2011-4528
Mon Dec 19 12:19:15 CET 2011
Unbound denial of service vulnerabilities from nonstandard
redirection and denial of existence VU#209659 CVE-2011-4528