AAAA is a domain address record, which is in essence the IPv6 address of the server where the domain is hosted. The IPv6 system was designed to replace the existing IPv4 system in which every single IP address is comprised of 4 sets of decimal digits which range from 1 to 255 e.g. 18.104.22.168. In contrast, an IPv6 address has eight groups of four hexadecimal digits - ranging from 0 to 9 and from A to F. The reason behind this transformation is the considerably smaller selection of unique IPs that the current system supports as well as the quick increase of products that are connected to the Internet. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to direct a domain address to a web server which uses this type of an address, you'll have to set up an AAAA record for it, and not the widespread A record, which is an IPv4 address. The 2 records deliver the very same function, but different notations are used, to distinguish the two forms of addresses.