By Deane Barker on April 8, 2013

Shodan: The scariest search engine on the Internet: After this article was published, Shodan went offline, which is probably for the best, because Shodan is a search engine that scours the Net looking for control interfaces for various hardware objects and real-life systems.

He found a car wash that could be turned on and off and a hockey rink in Denmark that could be defrosted with a click of a button. A city’s entire traffic control system was connected to the Internet and could be put into “test mode” with a single command entry. And he also found a control system for a hydroelectric plant in France with two turbines generating 3 megawatts each.