An AAAA record is an IP address within the freshly introduced IPv6 format and it is comprised of 8 different sets of hexadecimal digits, as opposed to the IPv4 IPs, which feature four sets of numbers between 1 and 255. An example of an IPv6 address would be 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the number of IPs that may be created is many times greater than the number of the IPv4 addresses. Every domain name has its web hosting server IP as a record and in essence, this record informs the domain name where the website for it is located. Depending on the system that the service provider employs, the record is going to be called A (IPv4) or AAAA (IPv6). Changing this record will allow you to host your website with one provider and your email messages with a different one, so if you decide to use this sort of redirection to forward a domain address to a server that uses an IPv6 address, you'll have to set up an AAAA record for it.