AAAA is a domain name record, that's essentially the IPv6 address of the web server where the domain is hosted. The IPv6 system was designed to replace the current IPv4 system where every single IP comprises of four groups of decimal digits which range from 1 to 255 e.g. 220.127.116.11. In contrast, an IPv6 address features eight groups of four hexadecimal digits - which range from 0 to 9 and from A to F. The cause of this modification is the substantially smaller number of unique IPs the present system supports as well as the quick increase of devices which are connected to the Internet. An illustration of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to point a domain address to a server that uses this kind of an address, you'll have to set up an AAAA record for it, not the widely used A record, which is an IPv4 address. Both records have the very same function, yet different notations are used, so as to differentiate the two forms of addresses.