AAAA is a domain record, that's in essence the IPv6 address of the web server in which the domain is hosted. The IPv6 system was designed to replace the existing IPv4 system where every single IP is made up of 4 sets of decimal numbers between 1 to 255 e.g. 126.96.36.199. However, an IPv6 address has eight sets of four hexadecimal numbers - from 0 to 9 and from A to F. The cause of this modification is the considerably smaller amount of unique IPs that the present system supports and the quick increase of gadgets 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 wish to forward a domain name to a machine that uses this kind of 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 very same function, but different notations are used, to separate the two sorts of addresses.