AAAA is a domain name record, that's in essence the IPv6 address of the web server where the domain name is hosted. The IPv6 system was designed to replace the current IPv4 system in which every single Internet protocol address consists of 4 groups of decimal numbers between 1 to 255 e.g. 188.8.131.52. On the other hand, an IPv6 address includes eight sets of four hexadecimal numbers - ranging from 0 to 9 and from A to F. The reason behind this change is the considerably smaller range of unique IPs that the current system supports and the fast increase of units that are connected to the Internet. An illustration of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to direct a domain address to a machine which uses this sort of an address, you have to create an AAAA record for it, and not the commonly used A record, which is an IPv4 address. The two records deliver the very same function, but different notations are used, in order to distinguish the two forms of addresses.