Each device that's connected to the Internet has a unique identifier known as IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, and so on. The pool of IP addresses, which was introduced at first, has been distributed, therefore the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain that opens a website has an IP record, that is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 split up by a dot, while within the IPv6 system it is called AAAA and it consists of eight sets of hexadecimal numbers i.e. this kind of records use digits 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 works with a substantially bigger amount of IPs in comparison with the IPv4 format.