How to search for open ports on network?

Question

I am wondering how I can scan for open ports on all devices that are hooked up to the router. For example: I got 3 computer connected to router. Each computer has something going on on their localhost:3000. My aim is to find all of those opened hosts - to get the following results (ip address on local network):

10.0.0.5:3000
10.0.0.10:3000
10.0.0.19:3000

Any ideas?

Answer 1

If you're under linux you can use nmap command for this task, for Windows I thinks you can install it too but idk about Windows.