AAAA is a domain name record, that is in essence the IPv6 address of the server in which the domain name is hosted. The IPv6 system was intended to replace the present IPv4 system in which each and every IP address consists of four groups of decimal digits between 1 to 255 e.g. 5.168.208.143. In contrast, an IPv6 address includes 8 groups of four hexadecimal numbers - ranging from 0 to 9 and from A to F. The cause of this modification is the substantially smaller range of unique IPs which the current system supports and also the fast increase of units which are connected to the world wide web. A good example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to direct a domain address to a machine that uses this sort of an address, you have to set up an AAAA record for it, and not the commonly used A record, that is an IPv4 address. The 2 records deliver the same exact function, yet different notations are used, in order to distinguish the two sorts of addresses.