Each device that's connected to the web has a distinctive identifier referred to as IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, and so on. The pool of addresses, which was introduced at first, has been distributed, therefore the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain that opens a 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 sets of numbers from 1 to 255 divided with a dot, while with the IPv6 system it is called AAAA and it consists 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 illustration 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.