Though IPv4 addresses are now an endangered species, most of the world has not yet moved to IPv6.
One way to help ease the transition from IPv4 to IPv6 is with DNS64, which is now being included on hardware from DDI (DNS, DHCP,IPAM)vendor Infoblox. DNS64 provides a translation layer for the AAAA record into an IPv4 A record and vice versa.
“DNS64 and NAT64 are technologies that enable people that are building out IPv6 networks to be able to let devices communicate with stuff on IPv4,” Cricket Liu, Infoblox vice president of Architecture and Technology told InternetNews.com. “For the time being most websites and mail servers you want to reach will all be on IPv4.”