Every single device that's connected to the Internet has a special identifier called 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 gradually getting replaced with IPv6 addresses. Every domain that opens a site has 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 four sets of numbers from 1 to 255 divided by a dot, while with the IPv6 system it is called AAAA and it is made up of 8 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 significantly greater number of IPs than the IPv4 format.