Each device that is connected to the world wide web has a unique identifier known as IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, and so on. The pool of addresses, that was introduced originally, has already been distributed, hence the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name that opens an internet site has an IP record, which is the address of the server where it's hosted. Using the IPv4 system, the record is called A and it is made up of four groups of numbers from 1 to 255 split up with a dot, while in the IPv6 system it's called AAAA and it comprises 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 example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format is designed for a significantly larger amount of IPs compared with the IPv4 format.