Every single device that is connected to the world wide web has a distinctive identifier called IP (Internet Protocol) address. This includes computer systems, web servers, smart phones, switches, etcetera. The pool of addresses, which was introduced at first, has been distributed, hence the so-called IPv4 IP addresses are steadily being replaced with IPv6 addresses. Every domain name which 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 sets of numbers from 1 to 255 separated with a dot, while with the IPv6 system it is called AAAA and it comprises of 8 sets 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 is designed for a substantially larger number of IPs than the IPv4 format.