AAAA is a domain address record, that's essentially 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 Internet protocol address is made up of four groups of decimal digits between 1 to 255 e.g. 18.104.22.168. However, an IPv6 address has eight groups of 4 hexadecimal digits - ranging from 0 to 9 and from A to F. The main reason for this transformation is the considerably smaller amount of unique IPs which the existing system supports and also the rapid increase of units which are connected to the world wide web. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to forward a domain name to a web server which uses this type of an address, you have to create an AAAA record for it, and not the widely used A record, that is an IPv4 address. The two records deliver the very same function, yet different notations are used, so as to separate the two sorts of addresses.