Every device which is connected to the world wide web has a distinctive identifier known as IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, etc. The pool of IP addresses, which was introduced at first, is already distributed, hence the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain which opens an internet site has an IP record, that is the address of the server where it's hosted. Using the IPv4 system, the record is called A and it consists of four groups of numbers from 1 to 255 separated with a dot, while with the IPv6 system it is called AAAA and it comprises of 8 groups of hexadecimal numbers i.e. this kind 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 substantially bigger number of IPs than the IPv4 format.