AAAA is a domain record, that is in essence the IPv6 address of the server in which the domain is hosted. The IPv6 system was introduced to replace the existing IPv4 system where each Internet protocol address consists of four sets of decimal numbers between 1 to 255 e.g. 126.96.36.199. In comparison, an IPv6 address has eight groups of four hexadecimal numbers - from 0 to 9 and from A to F. The cause of this change is the tremendously smaller amount of unique IPs which the present system supports and also the fast increase of products which are connected to the Internet. An illustration of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to point a domain address to a server which uses this sort of an address, you need to set up an AAAA record for it, not the widely used A record, which is an IPv4 address. The 2 records provide the exact same function, yet different notations are used, so as to differentiate the two types of addresses.