Each device that is connected to the web has a distinctive identifier referred to as IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, and so on. The pool of addresses, which was introduced at first, is already distributed, so the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name which opens an internet site has an IP record, that is the address of the server where it's hosted. With the IPv4 system, the record is called A and it is made up of four sets of numbers from 1 to 255 separated by a dot, while in the IPv6 system it is called AAAA and it is comprised of 8 groups of hexadecimal numbers i.e. this type 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 significantly larger amount of IPs when compared with the IPv4 format.