The framework includes a simple version numbering scheme to allow the parties in a DNS protocol exchange to determine which extension features the other party understands. This note proposes to replace the monolithic version numbering mechanism with a mechanism for listing an explicit set of protocol features that a particular implementation supports. We retain version numbering as a way of abbreviating the feature sets that we expect to see in common use. The Domain Name System is primarily used to translate domain names into IPv4 addresses using A RRs.
Several approaches exist to describe networks or address ranges.
This document specifies a new DNS RR type 'APL' for address prefix lists. In the Domain Name System, zone data is replicated among authoritative DNS servers by means of the 'zone transfer' protocol, also known as the 'AXFR' protocol. This memo clarifies, updates, and adds missing detail to the original AXFR protocol specification in RFC1034. This document mandates support for EDNS0 in DNS entities claiming to support either DNS Security Extensions or A6 records. This requirement is necessary because these new features increase the size of DNS messages.