AAAA is a domain record, which is basically the IPv6 address of the web server in which the domain name is hosted. The IPv6 system was introduced to replace the existing IPv4 system where each and every Internet protocol address consists of 4 groups of decimal numbers between 1 to 255 e.g. 5.168.208.143. In comparison, an IPv6 address has 8 groups of 4 hexadecimal digits - from 0 to 9 and from A to F. The main reason for this change is the substantially smaller number of unique IPs the present system supports and the quick increase of gadgets which 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 web server that uses such an address, you have to create an AAAA record for it, and not the widespread A record, which is an IPv4 address. Both records deliver the exact same function, but different notations are used, in order to differentiate the two types of addresses.