Every device which is connected to the web has a special identifier called IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etcetera. The pool of addresses, which was introduced initially, is already distributed, so the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain name that opens a site has an IP record, which is the address of the server where it's hosted. With the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 separated with a dot, while within the IPv6 system it is called AAAA and it comprises of 8 groups of hexadecimal numbers i.e. this kind of records use digits 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 works with a significantly larger amount of IPs in comparison with the IPv4 format.