Every device which is connected to the world wide web has a unique identifier named IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etc. The pool of addresses, that was introduced initially, has already been distributed, therefore the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name which 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 by a dot, while in the IPv6 system it is called AAAA and it consists of 8 groups of hexadecimal numbers i.e. this kind 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 can handle a considerably greater amount of IPs than the IPv4 format.