AAAA is a domain record, which is in essence the IPv6 address of the server in which the domain is hosted. The IPv6 system was intended to replace the existing IPv4 system where each and every IP address is made up of 4 groups of decimal numbers which range from 1 to 255 e.g. 18.104.22.168. However, an IPv6 address features eight groups of four hexadecimal digits - ranging from 0 to 9 and from A to F. The reason for this change is the significantly smaller number of unique IPs that the existing system supports and the rapid increase of units that are connected to the Internet. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to forward a domain name to a server that uses this kind of an address, you will need to create an AAAA record for it, and not the widespread A record, that is an IPv4 address. The two records provide the same exact function, but different notations are used, in order to distinguish the two types of addresses.