A Shodan Tutorial and Primer: Shodan is a search engine for finding specific devices, and device types, that exist online. The most popular searches are for things like webcam, linksys, cisco, netgear, SCADA, etc.
And then there is this: http://www.howtogeek.com/169575/how-to-ensure-your-router-cameras-printers-and-other-devices-arent-accessible-on-the-internet/