AAAA is a domain address record, that is basically the IPv6 address of the server in which the domain is hosted. The IPv6 system was designed to replace the present IPv4 system in which every IP consists of four sets of decimal digits which range from 1 to 255 e.g. 220.127.116.11. However, an IPv6 address includes eight sets of 4 hexadecimal digits - from 0 to 9 and from A to F. The cause of this change is the substantially smaller number of unique IPs that the present system supports as well as the fast increase of units that are connected to the Internet. An illustration of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to point a domain to a machine that uses this sort of an address, you'll have to create an AAAA record for it, not the commonly used A record, which is an IPv4 address. The two records have the very same function, but different notations are used, so as to identify the two sorts of addresses.