unbound 1.13.1 Validating, recursive, and caching DNS resolver

Unbound is a recursive-only caching DNS server which can perform DNSSEC validation of results. It implements only a minimal amount of authoritative service to prevent leakage to the root nameservers: forward lookups for localhost, reverse for and ::1, and NXDOMAIN for zones served by AS112. Stub and forward zones are supported.