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, smartphones, switches, etc. The pool of IPs, that was introduced initially, is already distributed, therefore the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain name that opens a 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 is comprised of 4 sets of numbers from 1 to 255 separated by a dot, while within the IPv6 system it is called AAAA and it comprises 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 supports a considerably greater number of IPs than the IPv4 format.