Every single device that is connected to the world wide web has a distinctive identifier called IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, etc. The pool of IPs, which was introduced initially, has been distributed, so the so-called IPv4 IP addresses are slowly being replaced with IPv6 addresses. Every domain name that opens a site comes with 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 is comprised of four sets of numbers from 1 to 255 split up by a dot, while in the IPv6 system it's called AAAA and it consists of eight sets of hexadecimal numbers i.e. this sort 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 supports a substantially greater amount of IPs when compared with the IPv4 format.