Every single device which is connected to the world wide web has a specific identifier called IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etcetera. The pool of IP addresses, which was introduced initially, has already been distributed, so the so-called IPv4 IP addresses are slowly getting replaced with IPv6 addresses. Every domain that opens a site comes with an IP record, that is the address of the server where it is hosted. Using the IPv4 system, the record is called A and it consists of four sets of numbers from 1 to 255 split up with a dot, while in 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. An example of an AAAA record is 2010:0c48:43d3:2142:1012:8c3a:2475:2435 and this format can handle a significantly greater number of IPs than the IPv4 format.