Every single device that's connected to the web has a special identifier named IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, etc. The pool of IPs, that was introduced at first, is already distributed, so the so-called IPv4 IP addresses are slowly being replaced with IPv6 addresses. Every domain name that opens a website has an IP record, that is the address of the server where it's hosted. With the IPv4 system, the record is called A and it comprises of 4 groups of numbers from 1 to 255 divided by a dot, while with the IPv6 system it is called AAAA and it comprises 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 larger amount of IPs when compared with the IPv4 format.