Industrial Protocols on the Open Internet: A ZoomEye Measurement of Modbus and EtherNet/IP
Industrial Protocols on the Open Internet: A ZoomEye Measurement of Modbus and EtherNet/IP Industrial control protocols were designed for isolated networks. ZoomEye measurements show how many of them are answering on the public internet, and where. Method Three product fingerprint queries were run against ZoomEye's combined dataset on 2026-09-20. Country facets were collected alongside each…
Three industrial control protocols, Modbus, EtherNet/IP, and Siemens S7, were measured for their presence on the public internet. ZoomEye's measurements revealed that Modbus was the most concentrated protocol, with 9,820 records, primarily from Cyprus. EtherNet/IP showed the most even distribution, with 585 records, primarily from the United States.
Siemens S7 was the least distributed, with 173 records, mostly from Germany. The results show that industrial protocols are indeed answering on the public internet, but the exposure is not limited to a single region. While these findings highlight the need for better management of industrial control systems' exposure, they also emphasize the importance of network architecture in mitigating risks associated with these protocols.
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