AAAA is a domain record, which is essentially the IPv6 address of the web server where the domain name is hosted. The IPv6 system was designed to replace the present IPv4 system where every single IP comprises of 4 sets of decimal numbers between 1 to 255 e.g. 126.96.36.199. In comparison, an IPv6 address features eight groups of four hexadecimal numbers - ranging from 0 to 9 and from A to F. The main reason for this transformation is the significantly smaller range of unique IPs the present system supports and also the speedy increase of products that are connected to the world wide web. An illustration of an IPv6 address is 2101:1f34:32e2:2415:1365:4f2b:2553:1345. If you'd like to direct a domain address to a machine which uses this type of an address, you have to set up an AAAA record for it, and not the commonly used A record, which is an IPv4 address. The 2 records deliver the same exact function, yet different notations are used, in order to identify the two forms of addresses.