Every device that's connected to the world wide web has a specific identifier known as IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, etc. The pool of IPs, that was introduced initially, has already been distributed, hence the so-called IPv4 IP addresses are progressively getting replaced with IPv6 addresses. Every domain which opens a website 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 is comprised of four sets of numbers from 1 to 255 divided by a dot, while within the IPv6 system it's called AAAA and it is made up 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 illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format can handle a significantly bigger number of IPs when compared with the IPv4 format.