Every device which is connected to the Internet has a specific identifier known as IP (Internet Protocol) address. This includes computer systems, web servers, smartphones, switches, etc. The pool of IP addresses, that was introduced originally, has been distributed, therefore the so-called IPv4 IP addresses are slowly being replaced with IPv6 addresses. Every domain that opens a site has an IP record, which is the address of the server where it's hosted. Using the IPv4 system, the record is called A and it comprises of 4 sets of numbers from 1 to 255 separated with a dot, while in the IPv6 system it is called AAAA and it comprises of eight 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 supports a substantially larger number of IPs than the IPv4 format.