Every device that is connected to the web has a specific identifier referred to as IP (Internet Protocol) address. This includes personal computers, web servers, smart phones, switches, and so on. The pool of addresses, that was introduced at first, has been distributed, so the so-called IPv4 IP addresses are gradually being replaced with IPv6 addresses. Every domain name that opens a website has an IP record, that is the address of the server where it's hosted. Using the IPv4 system, the record is called A and it comprises of 4 groups of numbers from 1 to 255 split up using a dot, while in the IPv6 system it is called AAAA and it is comprised 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 is designed for a considerably larger number of IPs when compared with the IPv4 format.