AAAA is a domain record, that's essentially the IPv6 address of the web server in which the domain name is hosted. The IPv6 system was designed to replace the present IPv4 system in which each and every Internet protocol address consists of four groups of decimal digits which range from 1 to 255 e.g. 126.96.36.199. On the other hand, an IPv6 address includes eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The cause of this transformation is the significantly smaller selection of unique IPs that the current system supports and the quick 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 wish to forward a domain to a machine which uses this kind of an address, you will need to create an AAAA record for it, and not the commonly used A record, that is an IPv4 address. The 2 records have the exact same function, but different notations are used, in order to differentiate the two forms of addresses.