Each device which is connected to the world wide web has a special identifier known as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of IP addresses, which was introduced originally, has already been distributed, therefore the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name that opens a site comes with an IP record, which is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it is comprised of 4 groups of numbers from 1 to 255 split up with a dot, while in the IPv6 system it's called AAAA and it is comprised of eight sets of hexadecimal numbers i.e. this kind of records use digits from 0 to 9 and letters from A to F. An example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format works with a considerably greater amount of IPs than the IPv4 format.