Shodan

Shodan a search engine specifically designed for the Internet of things. It allows the user to find specific types of things connected to the internet using a variety of filters. This is enabled by storing the meta-data that the IoT devices broadcast. Shodan allows user to determine all parts of your network that are accessible from the internet, categorise the things into types, show what devices are broadcasting using particular SCADA protocols (such as Modbus, S7, DNP2, Fox, BACnet, Ethernet/IP, GE-SRTP, HART and PCWorx) and show where they are being used geographically. 

Website: https://www.shodan.io/