Every device that's connected to the world wide web has a special identifier called IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of addresses, which was introduced initially, has already been distributed, so the so-called IPv4 IP addresses are progressively 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 made up of four groups of numbers from 1 to 255 divided by a dot, while with the IPv6 system it is called AAAA and it consists of eight groups of hexadecimal numbers i.e. this kind of records use numbers from 0 to 9 and letters from A to F. An illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format works with a considerably larger amount of IPs than the IPv4 format.