Each device which is connected to the Internet has a special identifier called IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, etcetera. The pool of addresses, which was introduced at first, has already been distributed, so the so-called IPv4 IP addresses are slowly being replaced with IPv6 addresses. Every domain that opens an internet site has an IP record, that is the address of the server where it is hosted. When using the IPv4 system, the record is called A and it comprises of 4 sets of numbers from 1 to 255 divided by a dot, while with the IPv6 system it is called AAAA and it consists 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 works with a significantly larger amount of IPs than the IPv4 format.