Setting up a private network for your Windows NT workstations? Don't have time, or can't get a registered address range for your network. According to RFC1597, the Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space your use for private networks:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 -
Read RFC1597 for background information including pros/cons of use of private ip addresses.