AAAA is a domain name record, that is in essence the IPv6 address of the web server where the domain is hosted. The IPv6 system was designed to replace the present IPv4 system in which every Internet protocol address is made up of 4 sets of decimal digits ranging from 1 to 255 e.g. 18.104.22.168. In contrast, an IPv6 address includes eight sets of four hexadecimal numbers - from 0 to 9 and from A to F. The reason for this modification is the considerably smaller amount of unique IPs the current system supports and also the quick increase of devices 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 wish to direct a domain name to a machine which uses this type of an address, you have to set up an AAAA record for it, not the widely used A record, which is an IPv4 address. The two records have the same exact function, yet different notations are used, so as to identify the two sorts of addresses.