Each device that is connected to the web has a specific identifier named IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, and so on. The pool of IP addresses, that was introduced initially, has been distributed, hence the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name that opens an internet site comes with an IP record, that is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it comprises of four groups of numbers from 1 to 255 divided using a dot, while in the IPv6 system it is called AAAA and it is comprised of 8 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 supports a considerably greater amount of IPs than the IPv4 format.