Each device which is connected to the world wide web has a specific identifier named IP (Internet Protocol) address. This includes computers, web servers, smart phones, switches, etc. The pool of IPs, that was introduced originally, has already been distributed, hence 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 is hosted. Using the IPv4 system, the record is called A and it comprises 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 consists of eight sets of hexadecimal numbers i.e. this sort of records use numbers 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 can handle a substantially larger number of IPs compared with the IPv4 format.