AAAA is a domain name record, that is basically the IPv6 address of the web server in which the domain is hosted. The IPv6 system was intended to replace the present IPv4 system where each IP address is comprised of four groups of decimal digits ranging from 1 to 255 e.g. 5.168.208.143. However, an IPv6 address includes eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The reason for this transformation is the significantly smaller range of unique IPs the present system supports and the quick increase of gadgets which are connected to the Internet. A good example of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to point a domain name to a server which uses this sort of an address, you have to set up an AAAA record for it, not the commonly used A record, which is an IPv4 address. The two records deliver the very same function, but different notations are used, so as to differentiate the two sorts of addresses.