Nozomi Networks
What Nozomi Networks actually does
Nozomi Networks passively monitors OT and IoT network traffic to build an asset inventory, detect anomalies, and identify vulnerabilities in industrial environments. The key word is passively — it watches network traffic without sending packets that could disrupt sensitive industrial processes. This is non-negotiable in environments where a misconfigured scan could shut down a production line.
The platform understands industrial protocols: Modbus, DNP3, IEC 104, BACnet, and dozens more. It automatically identifies PLCs, HMIs, RTUs, and other industrial assets, maps communication patterns, and alerts when something deviates from baseline. This catches both cyberattacks and operational anomalies.
Nozomi also provides vulnerability assessment against known CVEs for discovered OT assets, and compliance monitoring against frameworks like IEC 62443 and NERC CIP. The Vantage cloud platform aggregates visibility across multiple sites for distributed industrial operations.
Who it’s best for
- Manufacturing, energy, utilities, and critical infrastructure organizations with OT networks
- Security teams responsible for OT visibility that have zero tolerance for active scanning
- Organizations needing asset inventory across industrial control systems they didn’t build
- Companies subject to IEC 62443, NERC CIP, or similar OT compliance frameworks
- Enterprises managing multiple industrial sites that need centralized OT security monitoring
Pricing reality check
Nozomi is priced for industrial enterprises. Expect significant investment, especially for multi-site deployments. Pricing depends on the number of sensors deployed, assets monitored, and whether you use the cloud-based Vantage platform or on-prem management.
The total cost includes hardware sensors (or virtual appliances), platform licensing, and threat intelligence subscriptions. Factor in professional services for initial deployment — mapping an OT environment correctly takes time and domain expertise.
Alternatives to consider
- Claroty — Direct competitor with similar OT/IoT visibility. Stronger on the asset management and risk scoring side.
- Dragos — OT-focused with strong threat intelligence and incident response services. More services-oriented.
- Microsoft Defender for IoT (formerly CyberX) — Lower cost option if you’re a Microsoft shop. Less depth in industrial protocol support.
- Armis — Agentless asset intelligence across IT, OT, and IoT. Broader scope but less OT protocol depth.
The Charting Cyber take
Nozomi Networks is a legitimate leader in OT and IoT security monitoring. The passive approach is the right architecture for industrial environments, and the protocol coverage is extensive. If you’re running a manufacturing plant, power grid, or water treatment facility and you can’t see what’s on your OT network, Nozomi will fix that.
The caveat: OT security tools show you problems that are expensive and slow to fix. Legacy PLCs with known vulnerabilities can’t always be patched. Network segmentation in brownfield OT environments is a multi-year project. Buy Nozomi when you’re committed to an OT security program, not when you just want a checkbox. The visibility is only valuable if you have a plan for what comes after.