If you need large numbers of addresses on your network, and they do not need to be routed on the Internet, you can use private IP addresses that the Internet Assigned Numbers Authority (IANA) recommends. The following address ranges are designated as private networks that should not be advertised:

(1) 10.0.0.0 through 10.255.255.255
(2) 172.16.0.0 through 172.31.255.255
(3) 192.168.0.0 through 192.168.255.255