Every device that is connected to the world wide web has a specific identifier named IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, and so on. The pool of IP addresses, which was introduced initially, is already distributed, hence the so-called IPv4 IP addresses are slowly getting replaced with IPv6 addresses. Every domain name which opens an internet site comes with an IP record, that is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 split up with a dot, while within the IPv6 system it's called AAAA and it comprises of eight sets of hexadecimal numbers i.e. this kind 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 can handle a considerably larger amount of IPs compared with the IPv4 format.