Each device that's connected to the world wide web has a distinctive identifier known as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of addresses, that was introduced originally, is already distributed, therefore the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain name which opens an internet site comes with an IP record, which is the address of the server where it's hosted. With the IPv4 system, the record is called A and it is comprised of four sets of numbers from 1 to 255 separated using a dot, while within the IPv6 system it is called AAAA and it consists of eight groups of hexadecimal numbers i.e. this type of records use numbers from 0 to 9 and letters from A to F. A good example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format is designed for a substantially larger amount of IPs in comparison with the IPv4 format.