An AAAA record is an IP address within the newly launched IPv6 format and it is comprised of eight different groups of hexadecimal digits, unlike the IPv4 IPs, which feature four groups of digits between 1 and 255. An illustration of an IPv6 address is 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and in this format the sheer number of IPs which can be created is many times larger than the number of the IPv4 addresses. Every domain has its website hosting server Internet protocol as a record and in essence, this record instructs the domain address where the website for it is located. Depending on the system which the company uses, the record is going to be called A (IPv4) or AAAA (IPv6). Changing this record will allow you to host your website with one company and your email messages with a different one, so if you decide to use this sort of redirection to point a domain to a server that uses an IPv6 address, you'll have to set up an AAAA record for it.