AAAA is a domain name record, that's basically the IPv6 address of the web server where the domain name is hosted. The IPv6 system was introduced to replace the current IPv4 system where each IP address comprises of four sets of decimal numbers ranging from 1 to 255 e.g. 18.104.22.168. However, an IPv6 address features eight groups of 4 hexadecimal numbers - ranging from 0 to 9 and from A to F. The main reason for this change is the tremendously smaller number of unique IPs that the present 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 wish to forward a domain address to a web server which uses this sort of an address, you need to create an AAAA record for it, not the commonly used A record, that is an IPv4 address. Both records deliver the very same function, but different notations are used, to identify the two sorts of addresses.