Each device which is connected to the world wide web has a distinctive identifier referred to as IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, and so on. The pool of IPs, which was introduced originally, has already been distributed, so the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain that opens a site comes with an IP record, which is the address of the server where it's hosted. With the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 separated with a dot, while in the IPv6 system it's called AAAA and it comprises of 8 sets of hexadecimal numbers i.e. this type 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 can handle a substantially greater number of IPs than the IPv4 format.