Every device that's connected to the world wide web has a specific identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etcetera. The pool of IPs, which was introduced at first, has already been distributed, so the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain name that opens an internet site comes with an IP record, which is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it is comprised of 4 sets of numbers from 1 to 255 split up using a dot, while within the IPv6 system it's called AAAA and it is made up of 8 sets of hexadecimal numbers i.e. this type of records use numbers 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 is designed for a considerably greater number of IPs than the IPv4 format.