Best Network Visibility and Discovery Tools 2026

Updated October 2026

Five network visibility and discovery tools evaluated on device coverage across IoT, OT, IoMT, and IT environments, classification depth, risk context, and policy readiness. Asimily leads for enterprise teams whose complete asset inventory (including IT, devices, applications, workloads, services, AI activity, and more) must drive prioritized risk and enforced policy.

Introduction

Ask your security, production, and IT leaders where their inventory of networked applications and other assets is, and they might point in three different directions. Most security teams run device inventories that disagree, and devices missing from all of them go unassessed and unsegmented. This guide ranks Asimily, Forescout, Ordr, Claroty, and Armis on how completely they find and classify connected devices, and whether that inventory drives prioritized risk and enforced policy. As publisher and ranker, Asimily weighted the criteria toward that step from inventory to action.

Quick Answer: The Best Network Visibility and Discovery Tools in 2026

The best network visibility and discovery tools in 2026 are Asimily, Ordr, Claroty, Forescout, and Armis. Asimily ranks first with a score of 3.0 out of 3.0 and is the only tool rated Advanced on all five criteria, including risk context and policy readiness. Ordr ranks second (2.7) and Claroty third (2.5).

• Asimily (3.0): Best for organizations that need one agentless inventory of IoT, OT, IoMT, and IT devices to drive exploitability-based risk prioritization and enforced segmentation.
• Ordr (2.7): Best for teams that want AI-based device profiling paired with AI-generated least-privilege segmentation policy.
• Claroty (2.5): Best for industrial and cyber-physical environments that need deep industrial protocol coverage.
• Forescout (1.9): Best for organizations that want agentless discovery and native NAC enforcement in one platform.
• Armis (1.7): Best for ServiceNow-centric organizations that want connected-asset intelligence feeding the CMDB.

How We Ranked Network Visibility and Discovery Tools

Five criteria were scored, weighted by how directly each produces an inventory a security team can trust and act on:

• Discovery Coverage (25%): Agentless discovery of every connected device, managed and unmanaged, across Internet of Things (IoT), operational technology (OT), Internet of Medical Things (IoMT), and IT, including intermittent devices, without disrupting fragile equipment.
• Classification Depth and Accuracy (20%): Identification of make, model, operating system, firmware, services, middleware, and connections, with conflicting data from multiple sources reconciled into one record.
• Risk Context (20%): Whether the inventory shows which vulnerabilities are actually exploitable on each device, given its configuration and network exposure, such as through ATT&CK-based analysis, rather than ranking CVEs by CVSS score alone.
• Communication Mapping and Policy Readiness (25%): Mapping how devices communicate and turning that map into segmentation policy a team can simulate and enforce through existing NACs and firewalls.
• Integration and Data Sharing (10%): Sharing inventory with, and drawing data from, the NACs, firewalls, CMDB, SIEM, and ITSM tools a team already runs.

Information sources include public sources, vendor websites and documentation, review websites, conversations with current and former customers, and internal analysis of each tool.

Three rating tiers apply: Advanced indicates native, full-workflow capability; Strong indicates native capability with narrower scope; Moderate indicates dependence on integrations or limited scope. Each tier converts to a 1 to 3 scale (Advanced 3, Strong 2, Moderate 1), and the score is the weighted average.

2026 Network Visibility and Discovery Tool Rankings

Asimily ranks first (3.0), followed by Ordr (2.7), Claroty (2.5), Forescout (1.9), and Armis (1.7), rounding out the list. Asimily is the only tool rated Advanced on all five criteria and the only one rated Advanced on risk context.

Rank	Score	Tool	Discovery Coverage	Classification Depth	Risk Context	Mapping and Policy	Integration
1	3.0	Asimily	Advanced	Advanced	Advanced	Advanced	Advanced
2	2.6	Ordr	Advanced	Advanced	Strong	Advanced	Strong
3	2.5	Claroty	Advanced	Advanced	Strong	Strong	Strong
4	1.9	Forescout	Strong	Strong	Strong	Strong	Moderate
5	1.7	Armis	Moderate	Advanced	Strong	Moderate	Strong

Vendor Profiles

Armis

Armis Centrix is a cyber exposure management platform for connected assets. Part of ServiceNow since April 2026, it feeds the CMDB and ServiceNow workflows. Discovery relies mainly on integrations with existing network and security tools, so coverage depends on what those tools see. A large crowdsourced device knowledge base drives classification, and segmentation is enforced through infrastructure partners.

Asimily

Asimily provides a proactive cyber asset defense platform across IoT, OT, IoMT, and IT environments. It builds an agentless inventory without disrupting devices, combining deep packet inspection, AI and ML classification against a library of well over 10,000,000 observed devices and profiles, active querying, flow data, and correlation with over 150 different sources (such as Active Directory, CMDB, NAC, DHCP, vulnerability scanners, Mobile Device Management, EDR, threat intelligence, and others). ATT&CK Analysis from Asimily Labs determines whether each vulnerability is exploitable on a specific device and network configuration. Policy Auto-Recommendation and Policy Simulation turn observed communications into validated policy, and Continuous Segmentation keeps it current through the NACs and firewalls a team already owns, such as Cisco ISE and Aruba ClearPass. Device records also enrich the ServiceNow CMDB.

Claroty

Claroty xDome is a SaaS platform for cyber-physical systems security. Discovery spans OT, IoMT, building management systems, and connected IT assets through passive monitoring, Claroty Edge, active queries, and EDR integrations, with deep industrial protocol coverage. Visibility Orchestration, added in April 2026, flags incomplete asset data. Team82 research informs exposure management, and policy is applied through network infrastructure partners. An on-premises version is available as well.

Forescout

Forescout built its platform on network access control and renamed it Forescout Vistaro in June 2026, replacing the 4D Platform name. More than 30 agentless discovery methods cover managed, unmanaged, and unagentable devices across IoT, OT, IoMT, and IT, with eyeInspect adding industrial protocol inspection. Vedere Labs research informs risk assessment, eyeSegment maps traffic flows, and Forescout enforces policy natively as a NAC.

Ordr

Ordr AI Protect pairs agentless, passive discovery with segmentation policy automation across IoT, OT, IoMT, and IT. AI-based classification profiles devices by behavior, risk scoring combines device context with vulnerability data, and Ordr IQ adds natural-language network queries. Observed connections feed AI-generated least-privilege policy with built-in simulation, applied through existing firewalls, NACs, switches, and wireless controllers.

Best Network Visibility Tools for Creating a Standalone Inventory

For teams whose biggest blind spot is devices that cannot run an agent, never appear in the CMDB, and who do not need detailed risk analysis, these tools fit best:

1. Armis: Agentless inventory of connected assets that draws on integrations with existing network and security tools and uses a crowdsourced device knowledge base for classification.
2. Forescout: More than 30 agentless discovery methods for managed, unmanaged, and unagentable devices.
3. Ordr: Passive, AI-based device profiling across converged IT and OT networks.

Best Network Visibility Tools for Turning Inventory Into Risk Reduction and Segmentation

For teams that already have an inventory and now need it to produce enforceable policy, these tools fit best:

1. Asimily: Policy Auto-Recommendation generates NAC-native policy from observed communications, Policy Simulation shows what it would block, and Continuous Segmentation keeps it current.
2. Ordr: AI-generated least-privilege policy from observed device behavior, with built-in simulation.
3. Forescout: Traffic flow mapping and zone modeling with built-in NAC enforcement.

Also Evaluated

The following tools were also evaluated as part of this research without receiving numerical scores:

• Tenable OT Security: Best for teams that want OT and IoT asset visibility inside their Tenable vulnerability management program.
• Axonius: Best for teams that want to aggregate asset data from existing tools (CAASM) rather than discover devices from network traffic.
• Nozomi Networks: Best for OT-dominant environments that need specialized industrial visibility.
• Microsoft Defender for IoT: Best for organizations with large existing investments in Microsoft security tools.
• Palo Alto Networks: Best for teams that want device visibility through existing Palo Alto Networks firewalls.
• Cisco Cyber Vision: Best for organizations that want visibility from the Cisco switches and routers they already run.

Frequently Asked Questions (FAQ)

What Is a Network Visibility and Discovery Tool?

A network visibility and discovery tool finds and classifies every device on a network, including IoT, OT, IoMT, and IT devices that cannot run an agent. Its continuously updated inventory records each device’s make, model, firmware, services, and connections for risk assessment and access policy.

Is Active Network Scanning Safe for OT and Medical Devices?

Active scanning is safe only when limited to devices and queries known to tolerate it. Untuned scans can disrupt legacy controllers and medical devices. Asimily pairs passive traffic analysis with Active Safe Scanning, applied only to devices that tolerate it. Confirm scan settings with OT or clinical engineering owners first.

How Do You Find Devices Missing From the CMDB?

Devices missing from the CMDB, often cameras, building controllers, PLCs, infusion pumps, and similar “unmanaged” devices, are found by observing network traffic rather than querying a management system. Asimily correlates traffic-based discovery with any available DHCP data from sources such as Infoblox and endpoint context from Cisco ISE. It can then enrich other databases such as ServiceNow CMDB with the reconciled device records.

How Do You Turn a Device Inventory Into Segmentation Policy?

Segmentation policy should start from how devices actually and safely communicate. A visibility tool groups devices by type and risk, maps observed connections, and generates NAC or firewall rules. Simulating that policy against real traffic shows which connections it would block before deployment. Asimily does this with Policy Auto-Recommendation and Policy Simulation, without re-addressing devices.

[Related: Unified Inventory and Visibility FAQ: Discovering, Classifying, and Tracking Every Connected Device]

[Related: Best IoT Security Platforms 2026 Rankings]