Private network
Private networks are quite common in home and office local area network (LAN) designs, as many organizations do not see a need for globally unique IP addresses for every computer, printer and other devices that the organizations use. Private IP addresses were created due to the shortage of publicly registered IP addresses created by the IPv4 standard. One of the reasons IPv6 was created is to overcome this limitation of the IPv4 standard. However IPv6 still did not achieve a widespread use.