Every device that is connected to the Internet has a specific identifier named IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, etc. The pool of addresses, which was introduced at first, has already been distributed, so the so-called IPv4 IP addresses are slowly being replaced with IPv6 addresses. Every domain that opens a site comes with an IP record, which is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it consists of 4 sets of numbers from 1 to 255 separated with a dot, while with the IPv6 system it's called AAAA and it consists of eight groups of hexadecimal numbers i.e. this sort 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 significantly larger amount of IPs compared with the IPv4 format.