Every device which is connected to the Internet has a specific identifier called IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etcetera. The pool of IPs, that was introduced at first, has been distributed, so the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain name which opens a website comes with an IP record, that is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it comprises of 4 groups of numbers from 1 to 255 separated with a dot, while with the IPv6 system it's called AAAA and it is comprised of eight sets of hexadecimal numbers i.e. this kind of records use digits 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 works with a significantly larger amount of IPs than the IPv4 format.