AAAA is a domain name record, that is in essence the IPv6 address of the server in which the domain name is hosted. The IPv6 system was introduced to replace the current IPv4 system where each and every Internet protocol address is made up of 4 groups of decimal digits between 1 to 255 e.g. 126.96.36.199. On the other hand, an IPv6 address has eight groups of four hexadecimal numbers - from 0 to 9 and from A to F. The reason behind this change is the substantially smaller selection of unique IPs which the existing system supports and the speedy 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'd like to direct a domain to a server that uses this type of an address, you need to set up an AAAA record for it, and not the widely used A record, which is an IPv4 address. The two records have the very same function, but different notations are used, in order to separate the two types of addresses.