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-RVHDNY-68-194-192-0-21 (NET-68-194-192-0-1) 68.194.192.0 - 68.194.199.255