AAAA is a domain address record, that's basically the IPv6 address of the web server in which the domain name is hosted. The IPv6 system was intended to replace the current IPv4 system where each IP address is comprised of four sets of decimal numbers which range from 1 to 255 e.g. 188.8.131.52. In comparison, an IPv6 address features 8 groups of four hexadecimal digits - ranging from 0 to 9 and from A to F. The cause of this change is the significantly smaller amount of unique IPs which the present system supports and also the speedy increase of units which are connected to the Internet. An illustration of an IPv6 address would be 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to direct a domain to a server which uses this sort of an address, you will have to create an AAAA record for it, and not the commonly used A record, that is an IPv4 address. The 2 records have the exact same function, but different notations are used, so as to separate the two types of addresses.