Each device which is connected to the world wide web has a special identifier known as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of addresses, which was introduced at first, has already been distributed, hence the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain which opens a website comes with 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 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 8 groups 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 is designed for a substantially larger number of IPs than the IPv4 format.