Optimum Online NETBLK-OOL (NET-24-188-0-0-1) 24.188.0.0 - 24.191.255.255 Optimum Online (Cablevision Systems) OOL-CPE-NRWLCT-24-188-248-0-22 (NET-24-188-248-0-1) 24.188.248.0 - 24.188.251.255