AAAA is a domain name record, that is in essence the IPv6 address of the server where the domain is hosted. The IPv6 system was intended to replace the present IPv4 system in which each and every Internet protocol address is made up of four sets of decimal digits which range from 1 to 255 e.g. 126.96.36.199. However, an IPv6 address features 8 groups of 4 hexadecimal digits - ranging from 0 to 9 and from A to F. The reason for this transformation is the tremendously smaller number of unique IPs the current system supports as well as the rapid increase of units that are connected to the world wide web. An example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to forward a domain to a web server that uses such an address, you'll have to create an AAAA record for it, and not the widely used A record, which is an IPv4 address. Both records deliver the exact same function, but different notations are used, so as to separate the two forms of addresses.