Every single device which is connected to the world wide web has a specific identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, and so on. The pool of addresses, that was introduced at first, has been distributed, therefore the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain name which opens a site comes with an IP record, which is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it is comprised of 4 groups of numbers from 1 to 255 separated using a dot, while in the IPv6 system it is called AAAA and it is made up of eight groups of hexadecimal numbers i.e. this kind 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 considerably greater number of IPs than the IPv4 format.