unbound: unbound (a validating, recursive, and caching DNSSEC resolver) unbound: unbound: Unbound is a validating, recursive, and caching DNS resolver. unbound: The C implementation of Unbound is developed and maintained by unbound: NLnet Labs. It is based on ideas and algorithms taken from a java unbound: prototype developed by Verisign labs, Nominet, Kirei and ep.net. unbound: unbound: It is designed as a set of modular components, so that also DNSSEC unbound: validation and stub-resolvers are easily possible. unbound: unbound: Homepage: https://unbound.net/