Every device that is connected to the web has a specific identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, and so on. The pool of addresses, that was introduced originally, has already been distributed, hence the so-called IPv4 IP addresses are slowly being replaced with IPv6 addresses. Every domain that opens an internet site has an IP record, that is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 divided by a dot, while within the IPv6 system it's called AAAA and it comprises of eight groups 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 can handle a substantially bigger number of IPs when compared with the IPv4 format.