AAAA is a domain name record, that's basically the IPv6 address of the web server in which the domain is hosted. The IPv6 system was intended to replace the current IPv4 system in which every Internet protocol address is comprised of 4 groups of decimal numbers between 1 to 255 e.g. 126.96.36.199. In contrast, an IPv6 address includes 8 groups of four hexadecimal digits - from 0 to 9 and from A to F. The reason behind this change is the tremendously smaller number of unique IPs that the present system supports and the rapid increase of units which are connected to the Internet. A good example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to forward a domain address to a web server 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 deliver the very same function, yet different notations are used, to separate the two sorts of addresses.