Every single device that is connected to the world wide web has a unique identifier known as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of IP addresses, that was introduced initially, has already been distributed, hence the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain which 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 comprises of four groups of numbers from 1 to 255 separated using a dot, while in the IPv6 system it is called AAAA and it is comprised of eight sets of hexadecimal numbers i.e. this sort 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 supports a considerably greater amount of IPs than the IPv4 format.