Every single device that is connected to the Internet has a unique identifier called IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, etc. The pool of addresses, which was introduced initially, has already been distributed, hence the so-called IPv4 IP addresses are gradually getting replaced with IPv6 addresses. Every domain that opens a site comes with an IP record, which is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 divided using a dot, while with the IPv6 system it is called AAAA and it comprises of eight sets of hexadecimal numbers i.e. this type of records use digits from 0 to 9 and letters from A to F. An illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format supports a considerably greater amount of IPs in comparison with the IPv4 format.