An AAAA record is an Internet protocol address within the newly released IPv6 format and it is made up of eight different groups of hexadecimal digits, in contrast to the IPv4 IPs, which feature four sets of numbers in between 1 and 255. An example of an IPv6 address is 3014:0d43:23a3:2354:1320:8f3b:2635:3254 and with this format the amount of IPs which can be created is many times greater than the number of the IPv4 addresses. Every domain has its website hosting server Internet protocol as a record and in essence, that record tells the domain address where the website for it can be found. Depending on the system which the company uses, the record will be called A (IPv4) or AAAA (IPv6). Changing this record will allow you to host your site with one provider and your emails with a different one, so if you decide to use such a redirection to forward a domain name to a server that uses an IPv6 address, you'll need to set up an AAAA record for it.