Every single device which is connected to the Internet has a distinctive identifier referred to as IP (Internet Protocol) address. This includes computers, web servers, smartphones, switches, etcetera. The pool of IP addresses, that was introduced at first, has already been distributed, hence the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain which opens a website comes with an IP record, which is the address of the server where it's hosted. When using the IPv4 system, the record is called A and it is comprised of four groups of numbers from 1 to 255 separated with a dot, while in the IPv6 system it's called AAAA and it comprises of 8 groups of hexadecimal numbers i.e. this type of records use digits 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 bigger number of IPs than the IPv4 format.