Every device that is connected to the world wide web has a specific identifier known as IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, etcetera. The pool of IPs, that was introduced originally, is already distributed, so the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain name which opens an internet site has 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 4 groups of numbers from 1 to 255 split up using a dot, while in the IPv6 system it is called AAAA and it comprises of eight groups of hexadecimal numbers i.e. this type of records use numbers from 0 to 9 and letters from A to F. A good example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format supports a significantly larger number of IPs when compared with the IPv4 format.