AAAA is a domain name record, that is basically the IPv6 address of the server in which the domain is hosted. The IPv6 system was designed to replace the current IPv4 system in which every single IP address consists of four groups of decimal numbers between 1 to 255 e.g. 22.214.171.124. However, an IPv6 address includes 8 groups of 4 hexadecimal digits - which range from 0 to 9 and from A to F. The main reason for this change is the considerably smaller selection of unique IPs that the existing system supports and the rapid increase of gadgets 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 forward a domain address to a machine that uses this type of an address, you'll have to create an AAAA record for it, and not the commonly used A record, that is an IPv4 address. The two records have the same exact function, but different notations are used, so as to distinguish the two types of addresses.