When enterprises think about endpoint security, employee computers are often the first devices that come to mind. Company-issued laptops are equipped with antivirus software, EDR, and asset management tools, enabling systems to track software versions, vulnerabilities, antivirus definitions, and device status while retaining records when anomalies occur. If every device shown in the management console appears healthy, the internal network may seem fully protected.

In practice, however, far more devices are connected to the corporate network than appear in the management console.

A contractor may bring a personal laptop onsite for maintenance, or a visitor may temporarily connect to the corporate network. A wireless device may be added to a meeting room, while individual departments may procure cameras, printers, or IoT devices on their own. Factories may also contain OT equipment and legacy systems on which software cannot be installed freely. Even a connected computer may lack the company-required antivirus or management agent because of a failed deployment, system reinstallation, or another issue.

These devices—present on the network but not fully visible to IT—are what create internal network blind spots.

A device that does not appear in the management console is not necessarily a security threat in itself. The real concern is that established security processes may break down when an enterprise cannot verify the device's identity and origin or determine who is responsible for managing it.

For example, effective vulnerability management requires knowing which assets need to be patched. Network access policies require knowing who or what is connecting before authorization can be determined. When an incident occurs, IT must first map the anomalous IP address to a specific device and user before conducting further investigation. If a device was never brought within the existing management scope, these tasks often remain dependent on manual searches and cross-system comparisons—or the device may not be discovered until after an incident.

2. The Real Risk of “Ghost Devices”: Uncertainty and Lack of Control

The term “ghost devices” refers to devices that are physically present on the corporate network but have not been fully identified or brought under management through existing processes. Their greatest risk is not necessarily what the devices themselves have done, but the enterprise's lack of sufficient information to determine who or what they are, why they are there, and whether they should remain connected.

This is why asset visibility has increasingly been recognized as a foundation of cybersecurity. In its 2026 OT Asset Management program, the U.S. National Institute of Standards and Technology (NIST) specifically noted that an incomplete asset inventory impairs an organization's ability to understand its cybersecurity risk. Asset discovery and continuous management are essential prerequisites for risk assessment, network segmentation, vulnerability management, incident response, and even Zero Trust.

Ghost devices also directly affect Zero Trust implementation. Zero Trust emphasizes continuous verification, which requires enterprises to know which users and devices are accessing resources. If the enterprise does not even know that a device exists, it becomes extremely difficult to apply identity verification, authorization, and security policies comprehensively.

In other words, device visibility is not an optional feature added after asset management is complete. It is a prerequisite for effective vulnerability management, access control, and incident investigation.

3. More Comprehensive Device Management: Visibility Without Agent Deployment Constraints

Many antivirus, EDR, patch management, and asset management tools obtain device information through agents installed on endpoints. This approach provides detailed visibility into operating systems, software versions, patches, antivirus status, and other endpoint information, making it an essential management method for computers already under enterprise management.

However, “managing devices in depth” and “first discovering that devices exist” are two distinct and necessary stages.

For an agent to function, the device must support its installation. When an enterprise is trying to understand its internal network, this can create a management gap for devices that cannot run an agent: the device is already connected to the network but remains outside the existing endpoint management process.

This is why enterprises need an earlier layer of device visibility in addition to the depth provided by endpoint management. Agents excel at providing detailed information on the software, patches, antivirus protection, and security status of managed devices. The preceding device visibility layer brings devices that are already connected to the corporate network—but do not yet have an agent installed—into the device inventory, giving the enterprise a more complete view of its internal network.

Only after an enterprise has a complete picture of which devices are on its network can it verify their identities and authorization status and determine how they should be managed.

4. From Complete Visibility to Continuous Management: UPAS NAC and ITAM Unify Device Governance

Device visibility is therefore the first step in internal network management, and NAC (Network Access Control) is a critical mechanism for addressing this requirement. NAC first identifies which devices are connected, then determines their identities, network locations, and authorization status, establishing a foundation for management as soon as they enter the network.

As noted above, not every device on a corporate network can support agent installation. UPAS NAC uses an agentless architecture to continuously discover devices connecting to the internal network without first deploying endpoint software. It captures IP and MAC addresses, device types, and connection information, allowing IoT and OT equipment, guest devices, and other endpoints to be brought within the management scope from the outset. Once a device has been identified, the enterprise can determine whether to permit its connection based on allowlists and established policies, and can alert, restrict, or block unknown or unauthorized devices.

Once every device is visible, the next step is to understand its status in greater depth. UPAS ITAM adds hardware, software, operating system, patch, antivirus, and compliance information, enabling administrators to move beyond the horizontal view of whether a device is online and determine whether it currently meets management requirements.

UPAS also integrates NAC and ITAM within a single platform, so device discovery, access decisions, and asset status do not need to remain fragmented across separate systems. Administrators can start with a single device and view its connection, authorization, and asset information together, reducing cross-system comparisons and manual consolidation.

5. Eliminating Ghost Devices: From Complete Visibility to Continuous Management

The challenge within corporate networks is not simply whether devices are secure, but whether they have been discovered in the first place. When devices that cannot easily—or cannot at all—support agent deployment connect to the network, and discovery remains limited to the scope of existing endpoint management, a gap emerges: the device is online, but the corresponding management information has not kept pace.

What enterprises truly need is a management foundation that continuously updates as devices change. As soon as a device connects, it should be identified and checked for authorization. Its asset and security status can then be monitored according to management requirements, keeping internal network information aligned with the actual environment.

UPAS first closes device visibility gaps with agentless NAC, then combines that visibility with ITAM asset information on the same platform. This extends management from “discovering devices” to “verifying access, monitoring status, and managing continuously.” In addition to bringing devices under control, the integrated platform reduces discrepancies caused by separate systems and manually reconciled inventories.

Visibility is the first step toward eliminating ghost devices. Integrating the information gained through visibility into management processes is what enables comprehensive internal network governance.