Each device which is connected to the Internet has a special identifier named IP (Internet Protocol) address. This includes personal computers, web servers, smartphones, switches, and so on. The pool of IPs, that was introduced at first, has been distributed, therefore the so-called IPv4 IP addresses are progressively being replaced with IPv6 addresses. Every domain name that opens a website comes with an IP record, that is the address of the server where it's hosted. With the IPv4 system, the record is called A and it consists of 4 groups of numbers from 1 to 255 split up using a dot, while within the IPv6 system it's called AAAA and it comprises of eight groups of hexadecimal numbers i.e. this type of records use digits from 0 to 9 and letters from A to F. An illustration of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format works with a considerably larger number of IPs when compared with the IPv4 format.