Forescout vs Asimily:
2026 Comparison

Introduction

Forescout and Asimily both discover connected devices without agents, inspect network traffic, classify assets, and connect to the wider security stack. They differ in where each one stops. Forescout is also a network access control (NAC) platform that controls and coordinates individual switches similar to Cisco ISE and other switch vendor software. Asimily uses NACs for enforcement of the microsegmentation policies it independently generates. This is based on exploitability analysis (ATT&CK Analysis) and high-detail inventory generation, which can then lead to generating segmentation policy that existing NACs and firewalls enforce.

Forescout renamed its 4D Platform the Vistaro platform on June 24, 2026 (Forescout), and Advent International has owned the company since August 2020 (Ropes & Gray). The sections below compare the two products in the order a program usually matures: inventory first, then exposure, response, and risk mitigations, including but not limited to network segmentation.

1. Inventory and Visibility

Both platforms build inventory without endpoint agents. Asimily expands coverage through 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, EDR, and Mobile Device Management. Active methods suit only devices that tolerate the traffic, so Asimily pairs them with passive collection. Asimily also discovers what runs on assets, including services, applications, middleware, and AI chatbots. Forescout describes more than 30 agentless discovery methods, millions of Device Cloud fingerprints for classification, and integrations with many security and IT products.

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2. Exposure Management

Inventory feeds exposure, and both platforms score risk per asset. Forescout’s eyeFocus, part of the Forescout Vistaro platform, gives each device a multifactor risk score from three factor groups:

• Configuration: known Common Vulnerabilities and Exposures (CVEs), Exploit Prediction Scoring System (EPSS) scores, and exposed services.
• Function: how critical the device is.
• Behavior: the device’s internet exposure.

Forescout correlates those CVEs with the CISA Known Exploited Vulnerabilities catalog (Forescout, 2026). Asimily ranks vulnerabilities by impact and likelihood, and its ATT&CK Analysis tests whether a vulnerability is exploitable on a specific device in its network context, so teams work from a shorter list of the riskiest devices. Asimily also recommends mitigations when no vendor patch exists, and its risk analysis draws on manufacturer security disclosures and software bills of materials (SBOMs). Risk Simulator then models how a fix would change a device’s risk score before anyone acts.

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Forescout column: public Forescout documentation as of October 2026.

3. Threat and Response

Both platforms detect anomalous behavior and can contain it. Asimily’s anomaly policies alert or quarantine devices through NACs and supported firewalls when a policy is violated. Forescout describes OT anomaly detection through eyeInspect and automated threat containment (Forescout, June 24, 2026). For incident response, Asimily can record packets from a monitored device, on demand or when a policy is violated, so responders start with the traffic itself and not only an alert.

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4. Risk Mitigation

Segmentation is a priority for most teams and still unfinished for many: Cisco’s 2025 Segmentation Report found that 79% call it a priority and only 33% have fully implemented it (Cisco, 2026). It is also where the two designs differ most. Forescout is also a NAC that competes with Cisco ISE: it assigns devices to VLANs, applies access control lists (ACLs), and supports both 802.1X and non-802.1X environments (Forescout, accessed October 29, 2026). Its eyeSegment product models zones and validates policies against live traffic before activation (Forescout, accessed October 29, 2026).

Asimily does not enforce at the switch itself. Asimily’s Segmentation Orchestration creates conflict-free policies from actual device behavior, simulates them against live traffic with Policy Simulation, previews the Enforcement Plan, and applies policy through existing NACs and supported firewalls. Continuous Segmentation then applies NAC and firewall policies automatically to new matching devices to get the most out of customers’ existing NAC and firewall investment. Asimily also adds IoT Patching and password management for supported IoT device types.

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5. Governance, Risk, and Compliance

Asimily’s Configuration Control captures configuration snapshots of IoT, OT, and IoMT devices to establish a known good state, detects configuration drift, and keeps a change history for audits. Forescout lists Automated Compliance among its platform offerings, with assessments against frameworks such as NIST Cybersecurity Framework (CSF) and IEC 62443 (Forescout, accessed October 29, 2026). Ask each vendor how compliance results and device change records reach auditors.

6. Sample Integrations

Both platforms integrate across IT and security tools. Forescout lists integrations with security and IT products (Forescout, June 24, 2026). Asimily correlates network, identity, endpoint, and service management data, plus scanner results, into one record per device, and can apply policy through supported NACs and firewalls. Asimily integration categories and sample products include:

• AI & LLM Providers: Google Gemini, Anthropic Claude, others
• CMMS / CMDB: ServiceNow Service Graph, Ivanti, i-doit, EQ2
• DHCP & DNS: Infoblox, BlueCat, EfficientIP
• Endpoint Detection and Response (EDR): CrowdStrike Falcon, Microsoft Defender, SentinelOne
• Firewalls & Network Infrastructure: FortiGate, Arista Agni, Juniper
• Identity and Access Management (IAM): Active Directory/LDAP, Azure SSO, SAML, Okta
• ITSM: ServiceNow ITSM, Jira, BMC Helix
• Location Services: Cisco Spaces, Aruba AirWave
• Mobile Device Management: Microsoft Intune, Jamf Pro, Jamf Cloud
• Network Access Control (NAC): Cisco ISE, Aruba ClearPass, FortiNAC, Forescout, Palo Alto Panorama
• Network Traffic Sources: NetFlow, sFlow, SNMP Walk
• Scanners and Vulnerability Management (VM): Tenable, Qualys, Rapid7
• SIEM: Elastic SIEM, CrowdStrike LogScale, Palo Alto Cortex XSOAR
• Threat Intelligence: Cisco XDR, CrowdStrike Falcon X

This is not a complete list. Integrations are added regularly.

7. Deployment Considerations

Both platforms avoid endpoint agents and support on-premises deployment, which matters for air-gapped and internet-restricted networks. Forescout describes on-premises appliances, virtual machines, and Docker-based containers, with hybrid and cloud-based options (Forescout, accessed October 29, 2026). Asimily is delivered as a cloud-based software as a service (SaaS) with on-premises deployment available, and collects data through Asimily Edge software on a dedicated appliance, a virtual machine, or switches that support Cisco application hosting.

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Worked Example: Segmenting a Group of IP Cameras

This example is illustrative, not a customer story. Observe: Asimily’s passive analysis shows IP cameras on one VLAN talking to a video server and a time server, and to nothing else. Profile: Asimily classifies the cameras by make, model, and firmware, and ATT&CK Analysis shows which of their exposures an attacker could actually use, so the group ranks high. Propose: Segmentation Orchestration drafts a policy that allows only the observed flows. Simulate: Policy Simulation runs the draft against live traffic and lists any port or service that would be blocked, before anything changes. Enforce: the Enforcement Plan shows the steps for the team’s existing NAC, such as a downloadable ACL (DACL) on Cisco ISE or Aruba ClearPass, or for a supported firewall. A team that runs Forescout can instead use Forescout’s own VLAN and ACL actions, driven by the risk attributes Asimily pushes into Forescout.

How to Test Both in a Proof of Value

Asimily’s stated expectation is value within 48 hours and most devices identified within 14 days. Run the same six checks on Forescout and on Asimily, on one site of your own network:

1. List the devices each platform finds on a sample VLAN, including devices that cannot run agents.
2. Ask which discovered exposures are exploitable in your environment, and why.
3. Take one proposed segmentation policy and record what it would block against observed traffic.
4. Confirm which enforcement point applies the policy, and how a change is rolled back.
5. Check what each platform does for a device that can be patched and for one that cannot.
6. Ask about data export, deployment model, which capabilities are licensed separately including eyeSight, eyeSegment, eyeInspect, and eyeExtend, and renewal terms.

When Forescout Fits Better

Forescout is the closer fit when the network itself must enforce access, and for teams that weigh its scale and certifications. Asimily has no switch-level enforcement of its own and relies on NACs and firewalls, so these cases favor Forescout:

• Native NAC enforcement. Forescout assigns VLANs, applies ACLs, and supports both 802.1X and non-802.1X environments (Forescout, accessed October 29, 2026).
• One vendor for discovery and access control. Forescout lists network access control, network segmentation, and asset inventory in one platform (Forescout, accessed October 29, 2026).
• Established vendor. Forescout’s company page lists Advent International and Crosspoint Capital Partners as investors and describes a long record in network access control (Forescout, accessed October 29, 2026).
• Industrial protocol depth. Forescout’s eyeInspect datasheet describes inspection of industrial protocols (Forescout, 2024).
• Federal cloud authorization. Forescout announced FedRAMP High authorization for its Vistaro cloud services on March 24, 2026 (Forescout). Buyers with federal requirements should confirm each vendor’s current status.
• Analyst presence. Gartner evaluated Forescout in its 2026 Magic Quadrant for CPS Protection Platforms and placed it among the Challengers. Asimily was not among the 13 vendors evaluated (Nozomi Networks summary, March 2026).

The Bottom Line

Forescout: Forescout is a network access control platform that also discovers, classifies, and scores risk for IoT, OT, IoMT, and IT assets without agents, and it enforces at the switch with VLAN and ACL actions. It suits teams that want discovery and enforcement from one vendor and weigh its installed base and federal cloud authorization.

Asimily: Asimily builds the inventory first, including software, services, applications, middleware, and AI workloads, then analyzes exploitability with ATT&CK Analysis, then creates, simulates, and continuously maintains segmentation policy that existing NACs and supported firewalls enforce. This can result in more intelligent segmentation, that understands risk. Apart from discovery and network segmentation, Asimily adds IoT Patching and Configuration Control. It does not enforce at the switch, so it works best beside the NAC a team already runs, Forescout included.

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