AAAA is a domain record, which is basically the IPv6 address of the server where the domain is hosted. The IPv6 system was intended to replace the present IPv4 system where each and every IP address is made up of four groups of decimal digits which range from 1 to 255 e.g. 184.108.40.206. In contrast, an IPv6 address features 8 groups of 4 hexadecimal numbers - ranging from 0 to 9 and from A to F. The reason for this transformation is the considerably smaller amount of unique IPs the current system supports and also the speedy increase of devices 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 point a domain to a machine that uses this type of an address, you will need to set up an AAAA record for it, not the widespread A record, that is an IPv4 address. The 2 records provide the same exact function, yet different notations are used, in order to separate the two forms of addresses.