Every single device that is 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 addresses, which was introduced at first, is already distributed, so the so-called IPv4 IP addresses are slowly getting replaced with IPv6 addresses. Every domain that opens a site has an IP record, that 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 four sets of numbers from 1 to 255 separated by a dot, while in the IPv6 system it's called AAAA and it consists of 8 sets of hexadecimal numbers i.e. this sort 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 larger number of IPs in comparison with the IPv4 format.