Each device that is connected to the world wide web has a special identifier called IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, etcetera. The pool of IP addresses, that was introduced initially, has been distributed, therefore the so-called IPv4 IP addresses are gradually 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's hosted. With the IPv4 system, the record is called A and it comprises of four sets of numbers from 1 to 255 separated by a dot, while within the IPv6 system it's called AAAA and it is made up of eight sets of hexadecimal numbers i.e. this kind of records use digits 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 substantially larger amount of IPs when compared with the IPv4 format.