AAAA is a domain address record, that's in essence the IPv6 address of the server where the domain name is hosted. The IPv6 system was introduced to replace the present IPv4 system where every Internet protocol address comprises of 4 sets of decimal digits between 1 to 255 e.g. 18.104.22.168. In contrast, an IPv6 address includes eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The reason behind this modification is the substantially smaller number of unique IPs that the present system supports and the rapid increase of devices which are connected to the world wide web. An illustration of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to direct a domain to a server that uses this sort of an address, you have to create an AAAA record for it, not the commonly used A record, which is an IPv4 address. The 2 records have the exact same function, yet different notations are used, to distinguish the two forms of addresses.