AAAA is a domain name record, that is basically the IPv6 address of the server in which the domain name is hosted. The IPv6 system was designed to replace the present IPv4 system in which each and every IP is made up of 4 groups of decimal numbers ranging from 1 to 255 e.g. 18.104.22.168. In comparison, an IPv6 address includes eight sets of 4 hexadecimal numbers - from 0 to 9 and from A to F. The reason behind this transformation is the substantially smaller selection of unique IPs the current system supports and the rapid increase of units which are connected to the world wide web. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to forward a domain to a server which uses such an address, you will have to create an AAAA record for it, and not the widespread A record, that is an IPv4 address. Both records provide the same exact function, yet different notations are used, so as to separate the two sorts of addresses.