Every single device which is connected to the Internet has a distinctive identifier known as IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, etcetera. 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 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 made up of 4 sets of numbers from 1 to 255 separated by a dot, while with the IPv6 system it is called AAAA and it comprises of 8 sets 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 compared with the IPv4 format.