AAAA is a domain record, which is basically the IPv6 address of the server where the domain is hosted. The IPv6 system was introduced to replace the current IPv4 system in which each Internet protocol address is made up of four groups of decimal digits which range from 1 to 255 e.g. 126.96.36.199. However, an IPv6 address has 8 sets of 4 hexadecimal digits - which range from 0 to 9 and from A to F. The reason behind this modification is the considerably smaller amount of unique IPs that the present system supports and the fast increase of products 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 want to point a domain address to a web server that uses this sort of an address, you need to set up an AAAA record for it, not the widespread A record, that is an IPv4 address. Both records have the very same function, yet different notations are used, to separate the two sorts of addresses.