Every device that's connected to the world wide web has a unique identifier known as IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, etc. The pool of addresses, which was introduced at first, has been distributed, so the so-called IPv4 IP addresses are gradually getting 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's hosted. Using the IPv4 system, the record is called A and it consists of four groups of numbers from 1 to 255 divided with a dot, while in the IPv6 system it is called AAAA and it consists of eight groups of hexadecimal numbers i.e. this type of records use numbers from 0 to 9 and letters from A to F. A good example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format can handle a substantially larger amount of IPs than the IPv4 format.