Every device that is connected to the Internet has a distinctive identifier called IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etc. The pool of IPs, which was introduced originally, is already distributed, so the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain which opens a site has an IP record, that is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it comprises of 4 groups of numbers from 1 to 255 split up with a dot, while within the IPv6 system it's 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 considerably bigger amount of IPs than the IPv4 format.