Each device that's connected to the world wide web has a specific identifier referred to as IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, etcetera. The pool of IPs, that was introduced initially, has already been distributed, therefore the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain name that opens an internet 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 comprises of 4 groups of numbers from 1 to 255 split up by a dot, while with the IPv6 system it's called AAAA and it consists of 8 groups of hexadecimal numbers i.e. this kind 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 can handle a considerably larger number of IPs in comparison with the IPv4 format.