AAAA is a domain address record, which is basically the IPv6 address of the server in which the domain name is hosted. The IPv6 system was introduced to replace the present IPv4 system where every IP consists of 4 sets of decimal numbers which range from 1 to 255 e.g. 5.168.208.143. However, an IPv6 address has eight groups of 4 hexadecimal digits - which range from 0 to 9 and from A to F. The cause of this change is the considerably smaller range of unique IPs that the existing system supports and also the fast increase of products which are connected to the Internet. A good example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to direct a domain to a machine that uses this kind of an address, you'll have to create an AAAA record for it, not the widely used A record, which is an IPv4 address. The two records provide the very same function, but different notations are used, to identify the two sorts of addresses.