BIND is an open source DNS software system including an authoritative server, a recursive resolver and related utilities.
BIND 9.11 has many new features, including catalog zones, dyndb, DNS cookies, minimal responses to 'any' queries, an RNDC python module and numerous new RNDC commands. This version is recommended for production use. First released in 2016, this Extended Support Version will be supported through December, 2021. Current ARM
BIND 9.12 introduced 'Serve-stale' and minimal responses, answer synthesis from cached NSEC responses, a new glue cache, refactored RPZ support, and dnstap log file rolling. This version is recommended for production use. This is the 2018 stable branch. A new stable branch, 9.14 will be issued in 2019. Current ARM
BIND 9.13 added the local copy of the DNS root zone and QNAME minimization. This version should be considered experimental and is not recommended for production use. This branch will form the basis for the next stable major version. Current ARM
BIND 9 is licensed under MPL2.0.