Every device that's connected to the world wide web has a special identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, and so on. The pool of IPs, that was introduced originally, has already been distributed, so the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain which opens an internet site has an IP record, that is the address of the server where it is hosted. With the IPv4 system, the record is called A and it comprises of four groups of numbers from 1 to 255 divided using a dot, while within the IPv6 system it's called AAAA and it is made up of eight sets of hexadecimal numbers i.e. this type of records use digits 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 supports a substantially bigger number of IPs when compared with the IPv4 format.