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

The C implementation of Unbound is developed and maintained by . It is based on ideas and algorithms taken from a java prototype developed by  labs, , and .

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 .

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