A great new resource has become available called Censys. https://www.censys.io/
This great resource was created by some guys at the University of Michigan.
Censys is a search engine that allows computer scientists to ask questions about the devices and networks that compose the internet. You will notice it is similar to Shodan (shodan.io) but from what I have seen, looks much more powerful… what a great tool for OSINT gathering!