Every device that's connected to the web has a distinctive identifier called IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, and so on. The pool of IPs, that was introduced at first, has been distributed, so the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name that opens a website comes with an IP record, which is the address of the server where it is hosted. With the IPv4 system, the record is called A and it is comprised of 4 sets of numbers from 1 to 255 split up with a dot, while within the IPv6 system it's called AAAA and it is made up of eight sets of hexadecimal numbers i.e. this type of records use digits 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 is designed for a significantly larger amount of IPs compared with the IPv4 format.