OT DEFENSEREVIEW

Intelligence for systems that move the physical world.

Operational technology defense intelligence

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ServiceNow completes its acquisition of Armis

The April 2026 close moves a major cyber-asset intelligence platform inside ServiceNow and puts asset identity, exposure, workflow, data use, packaging, and remediation ownership on the diligence agenda.

How the market is organized

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Visibility and context

An asset list is not an operational model

OT defense begins with identity, role, location, ownership, criticality, communication, dependency, version, configuration, exposure, and lifecycle. Collection methods have different coverage and operating risks.

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Detection and investigation

Network telemetry must lead to an accountable decision

Protocol decoding, baselines, threat content, packets, alerts, and cases matter only when teams can interpret process context, preserve evidence, and coordinate a response that does not create avoidable operational harm.

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Access and architecture

Remote work, identity, zones, and conduits are one control system

Vendor maintenance, engineering access, credentials, session paths, file transfer, emergency use, segmentation, and fail states need an explicit architecture and accountable owner at each boundary.

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Resilience and lifecycle

Protection is incomplete without recoverable operations

Exposure decisions, backups, configuration baselines, tested restoration, spares, incident authority, safety coordination, and product-support lifecycles determine whether a defense program can sustain the physical mission.

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Authorities and standards board

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NIST SP 800-82 Rev. 3
NIST SP 800-82 Rev. 4 pre-draft
NIST CSF 2.0
ISA/IEC 62443-2-1:2024
IEC PAS 62443-2-2:2025
OT defense operating domains
Asset inventory, context, and lifecycle
Network architecture, segmentation, and conduits
Vulnerability, exposure, and remediation governance
Detection, investigation, and operational response
Remote access, identity, and third-party control

Defense systems and organizations

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Industrial defense change log

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Transaction announcementAccenture announces agreements involving Dragos, runZero, and NetRise

The proposed combination could alter ownership, packaging, data, services, partner relationships, and the OT security market architecture.

Regulatory milestoneEU Cyber Resilience Act Chapter IV begins applying

Industrial product suppliers and buyers need exact legal-role, product, conformity, reporting, support, and evidence records tied to the staged dates.

Acquisition closeServiceNow completes the Armis acquisition

Buyers need current evidence for product identity, packaging, workflow, data governance, integrations, and organizational responsibility after the ownership change.

Provider researchDragos releases its 2026 OT cybersecurity year in review

Readers should preserve sample, denominator, method, source population, and provider-research classification beside every reported finding.

Standards developmentNIST begins the SP 800-82 Rev. 4 pre-draft process

Programs should preserve Rev. 3 as current final guidance while tracking the revision through explicit development states.

Standards publicationIEC publishes PAS 62443-1-6:2025

IIoT reviews need explicit device, gateway, edge, cloud, identity, data, update, supplier, and owner responsibilities.

Control Systems Research Desk

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OT DEFENSE REVIEW · 2026OT defense market architectureIndependent market research
Original analysis

How monitoring, exposure, access, segmentation, endpoint, controlled-transfer, OEM, managed-defense, and risk platforms divide the defensive stack.

The research connects the provider market, normalized capabilities, authority records, operating domains, and source limitations rather than presenting a score or universal winner.

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Conditional comparisons

Compare operating fit, not popularity

Dragos Platform vs Claroty
Nozomi Networks vs Tenable OT Security
Armis Centrix vs Forescout
Microsoft Defender for IoT vs Cisco Cyber Vision
Palo Alto Networks OT Security vs Fortinet OT Security