It appears that the number of industrial devices accessible from the internet has risen by 30 thousand over the past three years, (Mon, Apr 22nd)

It has been nearly three years since we last looked at the number of industrial devices (or, rather, devices that communicate with common OT protocols, such as Modbus/TCP, BACnet, etc.) that are accessible from the internet[1]. Back in May of 2021, I wrote a slightly optimistic diary mentioning that there were probably somewhere between 74.2 thousand (according to Censys) and 80.8 thousand (according to Shodan) such systems, and that based on long-term data from Shodan, it appeared as though there …

devices etc industrial internet protocols tcp