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 designed to replace the existing IPv4 system where each and every Internet protocol address is made up of four groups of decimal numbers which range from 1 to 255 e.g. 5.168.208.143. In contrast, an IPv6 address features eight sets of 4 hexadecimal numbers - from 0 to 9 and from A to F. The reason for this change is the considerably smaller range of unique IPs the present system supports and also the rapid increase of devices which are connected to the Internet. An example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to forward a domain address to a web server which uses such an address, you will have to create an AAAA record for it, not the widely used A record, that is an IPv4 address. The two records provide the very same function, but different notations are used, in order to differentiate the two forms of addresses.