Ask an OT Engineer: Identifying Internet-Exposed Devices for OT Security

The concept of air-gapped OT networks is largely a myth — and internet-exposed devices are prime targets for cyberattacks.

This "Ask an OT Engineer" segment addresses the critical challenge of identifying internet-exposed devices within Operational Technology (OT) environments. The expert explains why the concept of air-gapped networks is largely outdated and how increasing connectivity — from data historians to cloud-connected PLCs — creates new exposure risks.

The discussion highlights that these exposed devices are often the primary targets for cyberattacks, making their identification and remediation a top priority for robust OT security.

Key topics include:

• The evolving landscape of OT connectivity and the air-gapped myth

• Common ways OT devices become internet-exposed through cloud services and smart PLCs

• Practical methods for discovering internet-facing OT assets using network monitoring tools

• Why securing internet-exposed devices is a crucial first step in any OT security strategy

• Leveraging specialized tools for comprehensive asset visibility and exposure management