AAAA is a domain record, that is in essence the IPv6 address of the server in which the domain is hosted. The IPv6 system was designed to replace the present IPv4 system where each and every Internet protocol address is made up of 4 groups of decimal digits which range from 1 to 255 e.g. 5.168.208.143. However, an IPv6 address features 8 groups of 4 hexadecimal digits - from 0 to 9 and from A to F. The cause of this modification is the tremendously smaller range of unique IPs which the current system supports as well as the rapid increase of units which are connected to the world wide web. An illustration of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to direct a domain address to a server which uses this type of an address, you will have to create an AAAA record for it, and not the widely used A record, that is an IPv4 address. The 2 records have the exact same function, but different notations are used, in order to differentiate the two forms of addresses.