Every device that is connected to the world wide web has a unique identifier referred to as IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, etc. The pool of addresses, that was introduced initially, has been distributed, so the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain name which opens a 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 is comprised of four groups of numbers from 1 to 255 divided by a dot, while in the IPv6 system it is called AAAA and it is made up of 8 groups of hexadecimal numbers i.e. this type of records use digits 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 works with a substantially greater amount of IPs than the IPv4 format.