AAAA is a domain name record, that's essentially the IPv6 address of the server where the domain name is hosted. The IPv6 system was introduced to replace the current IPv4 system in which every Internet protocol address consists of 4 sets of decimal numbers ranging from 1 to 255 e.g. 18.104.22.168. In comparison, an IPv6 address has eight groups of 4 hexadecimal numbers - from 0 to 9 and from A to F. The reason behind this transformation is the tremendously smaller range of unique IPs which the existing system supports and also the speedy increase of units that are connected to the world wide web. An illustration of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you want to forward a domain to a machine that uses this kind of an address, you need to create an AAAA record for it, not the widespread A record, which is an IPv4 address. The 2 records have the exact same function, but different notations are used, so as to separate the two types of addresses.