Each device which is connected to the web has a specific identifier known as IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etcetera. The pool of addresses, which was introduced originally, has already been distributed, therefore the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain that opens an internet site has 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 consists of four sets of numbers from 1 to 255 divided with a dot, while within the IPv6 system it's called AAAA and it consists 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 can handle a substantially larger amount of IPs compared with the IPv4 format.