Every single device which is connected to the web has a specific identifier referred to as IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, etcetera. The pool of IPs, that was introduced initially, is already distributed, therefore the so-called IPv4 IP addresses are gradually 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 consists of four sets of numbers from 1 to 255 split up using a dot, while with the IPv6 system it is called AAAA and it is comprised of eight groups of hexadecimal numbers i.e. this type 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 considerably larger amount of IPs compared with the IPv4 format.