Shodan
Shodan is the world’s first search engine for Internet-connected devices.
Use Shodan to discover which of your devices are connected to the Internet, where they are located and who is using them. Websites are just one part of the Internet. There are power plants, Smart TVs, refrigerators and much more that can be found with Shodan!
Esimerkkihaku: linux upnp avtech – Shodan Search