Of these answers, only Shodan provides a searchable listing of vulnerable hosts including details of the system that was scanned. OpenVAS, CVE, and nmap do not provide central databases of vulnerable systems.
Users of the search engine Shodan can look for different types of servers that are online by using a variety of filters. Another way it has been described is as a search engine for service banners, which are metadata that the server returns to the client.
Shodan allows users to discover which devices are currently online, where they are located, and who is using them. Such devices can be found in almost any system, including business networks, security cameras, industrial control systems (ICS), and smart homes. Shodan is a service that browses the internet cataloguing connected equipment and the software that runs on it.
To learn more about Shodan, here
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