Every device that is connected to the Internet has a specific identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of IPs, that was introduced at first, is already distributed, therefore the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain which opens a site comes with an IP record, that is the address of the server where it is hosted. With the IPv4 system, the record is called A and it is made up of 4 sets of numbers from 1 to 255 split up by a dot, while within the IPv6 system it's called AAAA and it is made up of eight groups of hexadecimal numbers i.e. this type of records use numbers from 0 to 9 and letters from A to F. An example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format supports a substantially greater amount of IPs when compared with the IPv4 format.