Network Dictionary – DNS64 and DNS46

Terms describe the translation of an DNS A record for IPv4 into a AAAA record for IPv6 – DNS46.
And DNS64 is translation of the IPv6 AAAA record into the IPv4 A record.
So, DNS46 will be used for accessing websites on the Internet that are IPv6 only and where your internal systems IPv4 only. Conversely, DNS64 is used for hosts that are IPv6 only to access legacy IPv4 services.