Every device that's connected to the world wide web has a unique identifier named IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, etcetera. The pool of IPs, which was introduced originally, has been distributed, hence the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain that opens an internet site comes with an IP record, that is the address of the server where it's hosted. With the IPv4 system, the record is called A and it is comprised of 4 sets of numbers from 1 to 255 divided with a dot, while in the IPv6 system it is called AAAA and it consists of 8 groups of hexadecimal numbers i.e. this type 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 supports a considerably larger number of IPs when compared with the IPv4 format.