Shodan

While most servers on this list and around the world return web content on their result pages, Shodan returns device banners, open ports, default passwords, webcam addresses, and so on.

It is a search engine for the Internet of Things. So you can use it to search for any device connected to the internet. And that means routers, printers, servers, smart door cameras, smart speakers, and even refrigerators.

You can search by a phrase such as "Cisco", Netgear or "webcam" and then filter the results by location, hostname, IP address range, operating system, open ports, etc.

But although the site can be used for free, you will get the best results after you register a free account and log in. This will allow you to see more results and use filters correctly.

You can even find devices and servers with default passwords, which makes hacking easier. But be careful, because in most jurisdictions, Internet penetration is illegal.

Features: Search for hardware, IoT devices

Cons: Better results after logging in

Website: Shodan.io