Every single device that is connected to the world wide web has a specific identifier called IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, and so on. The pool of IPs, which was introduced initially, has been distributed, therefore the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain name which opens a site comes with an IP record, which is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it is made up of 4 groups of numbers from 1 to 255 divided by a dot, while with the IPv6 system it is called AAAA and it is made up of eight sets of hexadecimal numbers i.e. this kind 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 is designed for a significantly bigger number of IPs than the IPv4 format.