You dont need to scan them, shodan has done it for you. That's the point. Eg http://www.shodanhq.com/?q=Rockwell http://www.shodanhq.com/?q=Rockwell But yes,

You dont need to scan them, shodan has done it for you. That's the point. Eg http://www.shodanhq.com/?q=Rockwell http://www.shodanhq.com/?q=Rockwell But yes, as ever, don't do stupid stuff if youre not satisfied with your own safety.