AAAA is a domain 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 current IPv4 system in which each and every Internet protocol address consists of 4 sets of decimal digits which range from 1 to 255 e.g. 126.96.36.199. On the other hand, an IPv6 address has eight groups of four hexadecimal numbers - ranging from 0 to 9 and from A to F. The main reason for this modification is the considerably smaller range of unique IPs the current system supports as well as the fast increase of products 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'd like to forward a domain address to a server which uses this kind of an address, you need to create an AAAA record for it, not the commonly used A record, that is an IPv4 address. The two records have the same exact function, yet different notations are used, to identify the two forms of addresses.