Censys is a new Search Engine for devices exposed on the Internet, it could be used by experts to assess the security they implement. It is a search engine that scans the Internet searching for devices and return aggregate reports on how resources (i.e. devices, websites, and certificates) are configured and deployed. It represents a privileged instrument for the hackers that have to search for a specific target and need to gather information on its configuration. The free search engine was originally released by researchers from the University of Michigan.”]
Source: https://securityaffairs.co/wordpress/42725/hacking/censys-search-engine.html