AAAA is a domain address record, that's essentially the IPv6 address of the server where the domain is hosted. The IPv6 system was introduced to replace the present IPv4 system where every Internet protocol address consists of 4 groups of decimal numbers which range from 1 to 255 e.g. 5.168.208.143. In contrast, an IPv6 address includes eight groups of four hexadecimal numbers - which range from 0 to 9 and from A to F. The main reason for this change is the considerably smaller amount of unique IPs that the existing system supports and also the quick increase of units which are connected to the world wide web. An illustration of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to forward a domain name to a server that uses this type of an address, you have to set up an AAAA record for it, and not the widespread A record, which is an IPv4 address. Both records provide the same exact function, but different notations are used, to identify the two forms of addresses.