AAAA is a domain name record, that is essentially the IPv6 address of the server in which the domain name is hosted. The IPv6 system was intended to replace the existing IPv4 system where every IP address comprises of 4 groups of decimal numbers ranging from 1 to 255 e.g. 184.108.40.206. On the other hand, an IPv6 address has 8 sets of four hexadecimal digits - ranging from 0 to 9 and from A to F. The cause of this modification is the substantially smaller range of unique IPs which the present system supports and the rapid increase of products that are connected to the Internet. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to point a domain address to a machine that uses this type of an address, you will need to set up an AAAA record for it, and not the widespread A record, that is an IPv4 address. The 2 records deliver the same exact function, but different notations are used, so as to distinguish the two types of addresses.