BIND9 is an open-source DNS server software used for secure DNS services. It supports DNSSEC, dynamic updates, zone transfers, and load. The Berkeley Internet Name Domain (BIND) software implements a domain name server for several operating systems. BIND 9 can be configured as an authoritative name server, a resolver, and, on supported hosts, a stub resolver. While large operators usually dedicate DNS servers to a single function per system, smaller operators will find that BIND 9’s flexible configuration features support multiple functions, such as a single DNS server acting as both an authoritative name server and a resolver.
