Optimum Online NETBLK-OOL-5BLK (NET-68-192-0-0-1) 68.192.0.0 - 68.199.255.255 Optimum Online (Cablevision Systems) OOL-CPE-RNDHNJ-68-197-32-0-20 (NET-68-197-32-0-1) 68.197.32.0 - 68.197.47.255