Each device that is connected to the Internet has a specific identifier called IP (Internet Protocol) address. This includes PCs, web servers, smartphones, switches, and so on. The pool of IPs, that was introduced initially, has been distributed, hence 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, 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 sets of numbers from 1 to 255 divided using a dot, while within the IPv6 system it is called AAAA and it consists of eight groups of hexadecimal numbers i.e. this sort of records use numbers from 0 to 9 and letters from A to F. An illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format is designed for a considerably greater amount of IPs compared with the IPv4 format.