Shodan : Shodan is a search engine for hackers and pentesters , and it is used for grab the information of target using various keywords. Shodan having multiple options to find the IoT Devices.
See below image there is information showing “ exploring the internet of things”
Lets open the Shodan and search for the protocols as shown below
Our 1st Target is CoAP Protocol , and follow as shown below and we got information about CoAP protocols whoever using it , it means this type of search results will giving the information about the Company , and which purpose they are using this protocols.
Here we found the information of CoAP protocol on which port number is working , and which framework
there are using for running CoAP Protocols all information we got.
Some times if you dig deep you will get more information about the protocols and company details.
For remaining protocols are also same way to search in the “Shodan” and the same method followed in “Censys Search Engine”
Censys search engine results