AAAA is a domain name record, which is basically the IPv6 address of the web server in which the domain is hosted. The IPv6 system was designed to replace the current IPv4 system where every single Internet protocol address consists of four groups of decimal numbers between 1 to 255 e.g. 18.104.22.168. However, 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 considerably smaller selection of unique IPs the current system supports as well as the rapid increase of units that are connected to the world wide web. A good example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to direct a domain name to a web server which uses such an address, you need to set up an AAAA record for it, and not the widespread A record, that is an IPv4 address. Both records deliver the same exact function, yet different notations are used, so as to separate the two sorts of addresses.