In the Internet addressing architecture, a private network is a network that uses private IP 1 Private IPv4 addresses; 2 Dedicated space for carrier-grade NAT 20-bit block, 172.16.0.0 – 172.31.255.255, 1048576, 172.16.0.0/12 (255.240.0.0), 20 bits, 12 bits . Not logged in; Talk · Contributions · Create account · Log in .