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Table of Contents
Use netstat to view connections on Windows
Use ss and lsof on Linux/macOS to see more clearly
Graphical interface tools can also be done
Home Operation and Maintenance Linux Operation and Maintenance How to check active network connections

How to check active network connections

Jul 22, 2025 am 12:35 AM
Internet connection active

If you want to know the network connection on your current computer, you can view it through the command line tool; use netstat -ano on Windows to view all connections and PIDs, use ss -tulnp and lsof -i -P to obtain detailed information, and can also be monitored in real time through graphical interface tools such as resource monitor, nethogs, etc.

How to check active network connections

Want to know which network connections are running on your computer? Don't worry, this is not difficult. It can be done with just a few simple commands. The key is that you have to know which tool to use and how to see the results.


Use netstat to view connections on Windows

netstat which comes with Windows, is a very practical gadget that can list all currently active network connections. Open a command prompt (CMD or PowerShell) and enter:

 netstat -ano
  • -a all connections and listening ports
  • -n Display address and port in numeric form (not resolved into names)
  • -o the process ID (PID) that has the connection

The results you see will include local IP and port, external IP and port, connection status, and corresponding PID. If you want to check which program is connected, you can use this PID to find the corresponding process in the task manager.

Tips: If you only care about TCP connections, you can add a filter, such as:

 netstat -ano | findstr :TCP

Use ss and lsof on Linux/macOS to see more clearly

Linux and macOS users generally do not use netstat, but recommend using the ss command, which is faster and more modern. Try this command:

 ss -tulnp

Explain the parameters:

  • -t : Only view TCP connection
  • -u : UDP is also listed
  • -l : List the ports in the listening
  • -n : Do not resolve service name
  • -p : Display process information (root permission is required to see all)

If you want more detailed instructions, you can also use it with lsof :

 lsof -i -P

This command lists all processes that have opened network files, including protocol, local/remote address, status and other information, which is suitable for troubleshooting who is connecting to which website or service.


Graphical interface tools can also be done

It doesn't matter if you don't want to type a command. Now many graphical tools can help you see all the connections at a glance.

  • Windows can use Resource Monitor (shortcut key Ctrl Shift Esc to open Task Manager → Performance → Open Resource Monitor → Network Tag)
  • Mac/Linux can install tools such as nethogs , iftop , htop (with net plugin) to view traffic and connection status in real time

The advantage of these tools is intuitive, but the disadvantage is that they are a little troublesome to install, which is suitable for friends who don’t like the command line very much.


Basically these are the methods. Whether you want to troubleshoot abnormal connections, see which programs are secretly connected to the Internet, or debug your own applications, these methods are enough. The key is to choose the right tool based on the system and then understand the meaning of the output content.

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