Every device that's connected to the Internet has a specific identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etc. The pool of IPs, that was introduced initially, has already been distributed, therefore the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain name which opens a website has an IP record, that is the address of the server where it's hosted. Using the IPv4 system, the record is called A and it is comprised of 4 sets of numbers from 1 to 255 divided by a dot, while within the IPv6 system it is called AAAA and it comprises of 8 sets of hexadecimal numbers i.e. this kind of records use numbers from 0 to 9 and letters from A to F. A good example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format is designed for a substantially larger number of IPs in comparison with the IPv4 format.