Study finds over 1.7 million hosts responding on ports used by Niagara Supervisor

A cybersecurity researcher analyzed data from the ZoomEye search engine on September 27, 2026. The scan found over 902,000 hosts responding on port 1911 and over 816,000 hosts responding on port 4911. These ports are commonly used by the Niagara Supervisor framework, a system for managing building controls. The author cautions that the high counts likely represent the same class of device answering on multiple interfaces, not separate populations. The article emphasizes that remote access to such systems should be secured through a VPN, not simply by opening these ports to the internet.