AAAA is a domain record, that is in essence the IPv6 address of the web server where the domain is hosted. The IPv6 system was introduced to replace the current IPv4 system where every single IP is comprised of 4 sets of decimal digits which range from 1 to 255 e.g. 5.168.208.143. On the other hand, an IPv6 address includes eight groups of 4 hexadecimal digits - ranging from 0 to 9 and from A to F. The main reason for this change is the considerably smaller selection of unique IPs which the present system supports as well as the rapid increase of gadgets 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 want to point a domain address to a server which uses such an address, you need to create an AAAA record for it, and not the widespread A record, which is an IPv4 address. The 2 records provide the very same function, yet different notations are used, in order to separate the two sorts of addresses.