AAAA is a domain record, which is basically the IPv6 address of the web server where the domain name is hosted. The IPv6 system was intended to replace the current IPv4 system in which each and every IP address comprises of four sets of decimal numbers ranging from 1 to 255 e.g. 188.8.131.52. However, an IPv6 address features eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The cause of this change is the tremendously smaller selection of unique IPs which the present system supports as well as the quick increase of units that are connected to the world wide web. An example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to point a domain to a machine which uses this kind of an address, you have to create an AAAA record for it, and not the widespread A record, that is an IPv4 address. The two records provide the exact same function, yet different notations are used, to distinguish the two types of addresses.