AAAA is a domain address record, which is essentially the IPv6 address of the web server where the domain name is hosted. The IPv6 system was intended to replace the present IPv4 system in which each IP address consists of four sets of decimal digits ranging from 1 to 255 e.g. 126.96.36.199. However, an IPv6 address has 8 groups of 4 hexadecimal digits - from 0 to 9 and from A to F. The reason behind this modification is the substantially smaller amount of unique IPs which the current system supports and also the speedy increase of products that are connected to the Internet. An example of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you need to point a domain address to a web server which uses this sort of an address, you have to set up an AAAA record for it, not the commonly used A record, that is an IPv4 address. The two records have the very same function, yet different notations are used, in order to separate the two types of addresses.