Each device that is connected to the Internet has a unique identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etc. The pool of addresses, that was introduced originally, has already been distributed, hence the so-called IPv4 IP addresses are steadily getting replaced with IPv6 addresses. Every domain name that opens an internet site has an IP record, that is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 divided by a dot, while with the IPv6 system it's called AAAA and it consists 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 supports a significantly larger amount of IPs in comparison with the IPv4 format.