Every device that is connected to the Internet has a unique identifier referred to as IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, etcetera. The pool of IPs, which was introduced at first, has already been distributed, so the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain name that opens a site comes with 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 made up of four groups of numbers from 1 to 255 split up by a dot, while with the IPv6 system it is called AAAA and it is made up 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 example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format is designed for a significantly bigger number of IPs than the IPv4 format.