AAAA is a domain address record, that is in essence the IPv6 address of the server in which the domain is hosted. The IPv6 system was introduced to replace the present IPv4 system in which each IP address comprises of four groups of decimal digits ranging from 1 to 255 e.g. 188.8.131.52. On the other hand, an IPv6 address features 8 groups of 4 hexadecimal numbers - from 0 to 9 and from A to F. The reason behind this modification is the substantially smaller number of unique IPs that the present system supports as well as the quick increase of gadgets that are connected to the world wide web. A good example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you wish to direct a domain name to a server which uses this sort of an address, you'll have to set up an AAAA record for it, not the widely used A record, that is an IPv4 address. The two records provide the very same function, yet different notations are used, so as to identify the two types of addresses.