Every device that's connected to the Internet has a specific identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of IP addresses, which was introduced at first, has already been distributed, therefore the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain that opens a site has an IP record, which is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it is comprised of 4 sets of numbers from 1 to 255 separated 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 illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format works with a substantially greater number of IPs compared with the IPv4 format.