Medical Device DNS Filtering | IoMT & Connected Device Security

Why Connected Medical Devices Need DNS-Level Protection

The Internet of Medical Things has transformed patient care, but every connected device represents an attack surface. Infusion pumps communicate dosage updates over the network. Patient monitors transmit vitals to nursing stations. MRI and CT scanners download firmware patches from manufacturer servers. Each of these DNS-dependent communications is a potential entry point for attackers.

Medical devices often run legacy operating systems that cannot be patched, lack endpoint security software, and were never designed with modern web-based risks in mind. DNS filtering provides a network-level security layer that protects these vulnerable devices without requiring software installation or device modification, making it the ideal security control for IoMT environments.

Our DNS filtering service intercepts and evaluates every domain resolution request from medical devices on your network. Queries to known unsafe content restricted servers, unauthorized update repositories, and data leakage endpoints are blocked before the device can establish a connection, neutralizing content risks that bypass traditional device-level defenses.

FDA Cybersecurity & Medical Device Compliance

Address pre-market and post-market cybersecurity requirements with DNS-layer controls

FDA Pre-Market Guidance

The FDA expects medical device manufacturers to incorporate cybersecurity into device design. DNS filtering demonstrates a network-level control that can be documented in pre-market submissions, showing that the device ecosystem includes content filtering at the DNS resolution layer, addressing Section 524B requirements of the FD&C Act.

Post-Market Surveillance

Post-market cybersecurity management requires ongoing monitoring and vulnerability response. DNS query logging provides continuous visibility into medical device network behavior, identifying anomalous communication patterns that may indicate compromise and supporting coordinated vulnerability disclosure processes.

Network Segmentation Support

FDA guidance recommends network segmentation for medical devices. DNS filtering enforces segment-specific policies, ensuring that devices on clinical VLANs can only resolve domains appropriate to their function. An infusion pump should never need to resolve a social media domain, and DNS filtering enforces that restriction.

SBOM Complementary Control

Software Bill of Materials requirements help identify vulnerable components in medical devices. DNS filtering complements SBOM analysis by blocking network communications to domains associated with known exploits for identified vulnerabilities, providing runtime protection while patches are developed and deployed.

DNS Filtering Capabilities for Medical Device Networks

Specialized controls for the unique requirements of IoMT infrastructure

Device-Aware Policies

Create DNS filtering policies based on device type and function. Infusion pumps receive restrictive policies limiting DNS resolution to manufacturer update servers and hospital systems. Diagnostic workstations get broader access with content risk-focused filtering.

Allowlist-Only Mode

For critical life-sustaining devices, deploy allowlist-only DNS filtering that blocks all domain resolutions except explicitly approved destinations. This zero-trust approach ensures medical devices communicate only with verified, authorized endpoints.

Anomaly Detection Alerts

Receive immediate alerts when a medical device attempts to resolve an unusual domain. A patient monitor querying a domain in an unexpected country or an infusion pump contacting a newly registered domain triggers automated notifications to biomedical engineering and IT security teams.

VLAN-Based Segmentation

Assign different DNS filtering policies to each network segment. Medical device VLANs, clinical workstation networks, guest Wi-Fi, and administrative LANs each receive tailored filtering appropriate to the risk profile and function of connected devices.

Complete Query Audit Trail

Every DNS query from every medical device is logged with timestamp, source IP, requested domain, and filter decision. This forensic-grade audit trail supports FDA post-market surveillance requirements and provides essential data for incident investigation.

Zero-Latency Architecture

Medical devices require deterministic network performance. Our DNS resolvers deliver sub-5ms response times, ensuring that DNS filtering does not introduce clinically significant latency for time-sensitive medical device communications and real-time telemetry.

90M+

Domains in Database

58

Filtering Categories

<5ms

Query Response Time

100%

Device Agnostic

Medical Device DNS Filtering Use Cases

Real-world deployments protecting connected medical technology

1

Hospital IoMT Fleet Protection

A hospital with 3,000 connected medical devices spanning infusion pumps, patient monitors, ventilators, and diagnostic imaging equipment deploys DNS filtering to create a unified security layer. Each device category receives a tailored DNS policy: life-critical devices operate in allowlist-only mode while diagnostic systems receive content risk-focused filtering with broader access.

2

Medical Device Manufacturer Testing

A manufacturer preparing an FDA 510(k) submission uses DNS filtering in their test environment to demonstrate network security controls. DNS query logs from testing validate that the device communicates only with intended endpoints, documenting the cybersecurity posture as part of pre-market submission evidence and satisfying FDA reviewer expectations for network-level controls.

3

Ambulatory Surgical Center

An outpatient surgical center with connected anesthesia machines, vital sign monitors, and surgical navigation systems requires medical-grade security without hospital-scale IT resources. DNS filtering deploys on the facility router in minutes, immediately restricting all medical device DNS queries to approved domains and blocking known restricted domains targeting healthcare networks.

4

Remote Patient Monitoring

Connected home health devices transmitting patient data to clinical dashboards need protection at the DNS layer. DNS filtering on the gateway devices ensures that blood pressure monitors, glucose meters, and cardiac rhythm monitors only communicate with the authorized clinical platform, preventing data from being redirected to attacker-controlled servers.

Secure Your Medical Device Network at the DNS Layer

Protect connected medical devices without agents, software installs, or device modifications. Enterprise DNS filtering that meets FDA cybersecurity expectations.

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DNS Filtering for Connected Medical Devices