AAAA is a domain address record, that's basically the IPv6 address of the server in which the domain name is hosted. The IPv6 system was designed to replace the existing IPv4 system in which each and every IP is made up of 4 groups of decimal digits which range from 1 to 255 e.g. 126.96.36.199. In contrast, an IPv6 address includes eight groups of four hexadecimal digits - ranging from 0 to 9 and from A to F. The cause of this change is the considerably smaller selection of unique IPs which the current system supports and also the speedy increase of products which are connected to the Internet. An illustration of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to point a domain name to a web server that uses such an address, you have to set up an AAAA record for it, and not the commonly used A record, which is an IPv4 address. The two records provide the exact same function, but different notations are used, so as to differentiate the two sorts of addresses.