Each device that is connected to the world wide web has a special identifier known as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etcetera. The pool of IP addresses, that was introduced originally, has been distributed, therefore the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain 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 comprises of 4 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 eight sets of hexadecimal numbers i.e. this sort 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 substantially greater amount of IPs in comparison with the IPv4 format.