Every device that's connected to the world wide web has a unique identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etcetera. The pool of IPs, which was introduced initially, is already distributed, therefore the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain that opens a site comes with an IP record, which is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it is comprised of 4 groups of numbers from 1 to 255 split up with a dot, while in the IPv6 system it's called AAAA and it is made up of 8 sets of hexadecimal numbers i.e. this kind of records use numbers 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 works with a considerably larger amount of IPs in comparison with the IPv4 format.