When does building OT / ICS Security Platform make sense?

The build case is not realistic for most organizations. Industrial protocol parsing for Modbus, DNP3, EtherNet/IP, and dozens of other protocols required years of specialized engineering. Custom monitoring is viable only for narrow, single-protocol environments with known device types.

When does buying OT / ICS Security Platform make sense?

Buying earns its keep for any operator running industrial infrastructure. Generic network monitoring doesn't recognize process-specific anomalies in industrial control traffic. The vendor's deep protocol parsers are the product. The decision is which vendor's coverage matches your specific equipment inventory.

What are the main OT / ICS Security Platform vendors?

Representative vendors include Nozomi Networks, Tenable OT Security, Claroty, TXOne Networks. B4 Pro scores the full set.

Security & Compliance · Engineering, IT & AI

Should you build or buy OT / ICS Security Platform?

OT and ICS security platforms provide passive monitoring, asset discovery, and threat detection for operational technology environments including industrial control systems, SCADA networks, PLCs, and distributed control systems. Because active scanning can disrupt safety-critical industrial processes, these platforms rely on passive network traffic analysis and deep industrial protocol parsing to build visibility without touching the systems they're protecting.

The build-vs-buy decision for OT / ICS Security Platform turns on whether the deep industrial protocol parsers and safety-bounded passive monitoring design required for this environment are buildable from a single organization's resources, or represent engineering investment accumulated by specialized vendors over many years; the protocol coverage is the differentiator.

Domain: Security & Compliance
Function: Engineering, IT & AI
Industries: Cross-industry

Last assessed June 2026 · re-scored quarterly via The Continuum.

Build it, buy it, or bridge?

	Build it	Buy it	Bridge (buy, then extend)
Cost shape	Industrial protocol parsing expertise is scarce; no viable OSS path for production coverage	Custom enterprise pricing from Nozomi, Claroty, Dragos; stable or rising	Buy the passive monitoring platform; extend with org-specific alert tuning for process logic
Time to value	Years to build protocol parsers for even a fraction of the industrial protocol landscape	Weeks to asset discovery with passive deployment; no process disruption	Deploy platform quickly; integrate with existing SIEM and SOC workflows
Differentiation captured	Custom process-behavior baselines for specific facility logic	Vendor's protocol library covers Modbus, DNP3, EtherNet/IP, PROFINET, IEC-61850, and more	Platform's protocol coverage; org configures process-specific anomaly thresholds
AI feasibility today	Protocol parsing is not an AI-solvable problem; safety constraints add further complexity	Vendors adding ML-based anomaly detection on top of deep protocol visibility	Buy the protocol layer; build process-specific detection logic on top of vendor telemetry
Who it fits	Not viable for most organizations; custom monitoring covers narrow known-device scenarios	Any industrial operator with PLCs, SCADA, medical devices, or critical infrastructure	Orgs integrating OT visibility into broader IT/OT convergence and SIEM architecture

The B4 call

B4 has a verdict for OT / ICS Security Platform.

Build, Buy, Bridge, or Beware, with the five-dimension scorecard and the reasoning behind it. Unlock the call, and every other category, with B4 Pro.

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When building OT / ICS Security Platform makes sense

The build case for OT/ICS security platforms is narrow to the point of not being realistic for most organizations. The passive monitoring requirement, specifically not disrupting processes by actively scanning, means the tool must understand what it's observing at the protocol level without generating any traffic. That requires deep parsers for Modbus, DNP3, EtherNet/IP, PROFINET, IEC-61850, and dozens of proprietary vendor protocols. Those parsers required years of specialized engineering work. A custom monitoring approach for a single, well-documented device type in a controlled environment is the outer boundary of what's self-buildable. As soon as the OT estate includes more than one protocol family, the coverage gap becomes significant and the operational risk of incomplete monitoring in a safety-critical environment is a strong argument for vendor tooling.

When buying OT / ICS Security Platform makes sense

Buying earns its keep for any organization running industrial infrastructure where process-specific anomaly detection is the security requirement. Generic network monitoring tools don't recognize a PLC operating outside its expected parameter envelope or detect an unauthorized command in a DNP3 control sequence. Nozomi Networks, Claroty, and Dragos have built protocol parsers across the major industrial protocol families with safety-bounded, air-gap-compatible passive monitoring. For critical infrastructure operators and healthcare organizations with medical device networks, the asset inventory and vulnerability context these platforms provide are load-bearing operational intelligence. The decision is which vendor's protocol coverage matches the specific facility's equipment inventory, not whether to buy.

OT and ICS environments run protocols that the IT security world treats as edge cases: Modbus, DNP3, EtherNet/IP, PROFINET, IEC-61850, plus dozens of proprietary vendor protocols. Platforms like Nozomi Networks, Dragos, and Claroty have built deep protocol parsers across all of them, designed for passive monitoring in environments where any active scanning could trip a safety interlock. That constraint, safety-bounded, air-gap-compatible, protocol-specific, fundamentally shapes what buildable means.

Buying earns its keep for any operator running industrial infrastructure where process-specific anomaly detection is the requirement. Generic network monitoring doesn't surface a PLC operating outside its expected parameters. The build case is not viable here. The protocol expertise, safety constraints, and air-gap design requirements make OT/ICS security one of the hardest categories to self-build. The decision is really which vendor's protocol coverage matches the specific facility's equipment inventory.

Representative vendors

Nozomi NetworksDragos and 3 more, scored in B4 Pro

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Frequently asked

What is OT / ICS Security Platform?: OT and ICS security platforms provide passive monitoring, asset discovery, and threat detection for industrial control systems, SCADA networks, PLCs, and distributed control systems. Because active scanning can disrupt safety-critical processes, they rely on passive network traffic analysis and deep industrial protocol parsing to build visibility without touching the systems they're protecting.
When does building OT / ICS Security Platform make sense?: The build case is not realistic for most organizations. Industrial protocol parsing for Modbus, DNP3, EtherNet/IP, and dozens of other protocols required years of specialized engineering. Custom monitoring is viable only for narrow, single-protocol environments with known device types.
When does buying OT / ICS Security Platform make sense?: Buying earns its keep for any operator running industrial infrastructure. Generic network monitoring doesn't recognize process-specific anomalies in industrial control traffic. The vendor's deep protocol parsers are the product. The decision is which vendor's coverage matches your specific equipment inventory.
What are the main OT / ICS Security Platform vendors?: Representative vendors include Nozomi Networks, Tenable OT Security, Claroty, TXOne Networks. B4 Pro scores the full set.

The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to classify it Build, Buy, Bridge, or Beware. See the full methodology.

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