AAAA is a domain address record, which is basically the IPv6 address of the web server in which the domain name is hosted. The IPv6 system was intended to replace the present IPv4 system in which every single IP is comprised of four sets of decimal digits ranging from 1 to 255 e.g. 126.96.36.199. On the other hand, an IPv6 address has eight groups of 4 hexadecimal digits - ranging from 0 to 9 and from A to F. The reason for this modification is the substantially smaller selection of unique IPs the present system supports and the quick increase of devices 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 need to forward a domain name to a web server which uses this kind of an address, you will need to set up an AAAA record for it, not the commonly used A record, that is an IPv4 address. Both records provide the very same function, yet different notations are used, in order to separate the two sorts of addresses.