Censys is a search engine that enables researchers to ask questions about the hosts and networks that compose the internet. Censys collects data on hosts and websites through daily ZMap and ZGrab scans of the IPv4 address space, in turn maintaining a database of how hosts and websites are configured.
Using the Censys search auxiliary module, we can use the Censys REST API to access the same data accessible through the web interface. The search endpoint allows searches against the current data in the IPv4, top million websites, and certificates indexes, using the same search syntax as the primary site.