Each device that is connected to the Internet has a specific identifier named IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, etcetera. The pool of IPs, that was introduced originally, is already distributed, hence the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name which opens a website 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 4 groups of numbers from 1 to 255 separated by a dot, while in the IPv6 system it is called AAAA and it consists of 8 sets of hexadecimal numbers i.e. this type 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 supports a significantly bigger amount of IPs in comparison with the IPv4 format.