AAAA is a domain name record, that's in essence 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 each Internet protocol address consists of 4 groups of decimal digits which range from 1 to 255 e.g. 188.8.131.52. On the other hand, an IPv6 address features eight sets of four hexadecimal numbers - which range from 0 to 9 and from A to F. The reason behind this modification is the significantly smaller amount of unique IPs which the existing system supports and the speedy increase of products which are connected to the Internet. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to direct a domain address to a web server which uses such an address, you need to create an AAAA record for it, not the widespread A record, which is an IPv4 address. The two records provide the same exact function, yet different notations are used, so as to separate the two forms of addresses.