Every single device that is connected to the Internet has a distinctive identifier called IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, etc. The pool of addresses, which was introduced at first, is already distributed, hence the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain that opens an internet site comes with an IP record, which is the address of the server where it is hosted. With the IPv4 system, the record is called A and it comprises of four groups of numbers from 1 to 255 divided using 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 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 is designed for a significantly bigger number of IPs compared with the IPv4 format.