Each device which is connected to the Internet has a unique identifier called IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etc. The pool of IP addresses, which was introduced originally, has already been distributed, so the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain name that opens a site comes with 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 comprises of four sets of numbers from 1 to 255 split up using a dot, while within the IPv6 system it's called AAAA and it consists of 8 sets 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 can handle a significantly greater amount of IPs compared with the IPv4 format.