Every single device that's connected to the world wide web 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 originally, has already been distributed, so the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain that opens an internet site comes with an IP record, which is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it comprises of four groups of numbers from 1 to 255 divided with a dot, while within the IPv6 system it's called AAAA and it is made up of 8 groups of hexadecimal numbers i.e. this type of records use digits 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 considerably greater amount of IPs compared with the IPv4 format.