Every device that's connected to the Internet has a specific identifier called IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, and so on. The pool of IP addresses, which was introduced at first, is already distributed, so the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain that opens a website comes with 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 made up of four groups of numbers from 1 to 255 divided using a dot, while in the IPv6 system it is called AAAA and it is comprised of eight sets of hexadecimal numbers i.e. this type of records use digits from 0 to 9 and letters from A to F. An example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format can handle a considerably bigger amount of IPs than the IPv4 format.