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 existing IPv4 system where each Internet protocol address comprises of four sets of decimal numbers ranging from 1 to 255 e.g. 126.96.36.199. In contrast, an IPv6 address features 8 sets of 4 hexadecimal digits - which range from 0 to 9 and from A to F. The cause of this change is the significantly smaller range of unique IPs the present system supports and also the quick increase of units that are connected to the world wide web. A good example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to direct a domain name to a web server that uses such an address, you need to create an AAAA record for it, and not the widely used A record, that is an IPv4 address. The two records provide the same exact function, but different notations are used, to differentiate the two sorts of addresses.