AAAA is a domain name record, that's basically the IPv6 address of the server where the domain name is hosted. The IPv6 system was designed to replace the present IPv4 system where each and every IP address comprises of 4 sets 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 numbers - ranging from 0 to 9 and from A to F. The cause of this modification is the significantly smaller selection of unique IPs the current system supports and the fast increase of products which are connected to the world wide web. A good example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to point a domain address to a web server which uses this type of an address, you have to set up an AAAA record for it, not the commonly used A record, that is an IPv4 address. Both records deliver the same exact function, but different notations are used, so as to distinguish the two forms of addresses.