Google is a search engine for human readable content. Shodan does the same for machine readable content.
You can:
search for specific IP addresses, and it will show you the active ports, and running services.
search for a specific response header in the set of countries
browse through the screenshots of open VNC & RDP
open webcams
and more…
The free accounts can use any feature, but the list of results is limited.
But if you really want to look under the deck of the internet, the subscription is worth it.
You are not logged in. However you can subscribe from another Fediverse account, for example Lemmy or Mastodon. To do this, paste the following into the search field of your instance: !technology@lemmy.world
This is a most excellent place for technology news and articles.
Website must be getting hammered, because I can’t navigate anywhere.