How to find out ports used by applications on Windows? (2024)

FAQs

How to find out ports used by applications on Windows? ›

Use netstat -anob to list all established and listening ports. The command "netstat -anob" shows all in-use ports and the binary (application) which use them. Example: In this example we see the process msg_server.exe which is listening on ports 3600 and 3900.

Go to Processes/Services in the Task Manager (for processes, select "Show processes of all users"). "Select View\Columns -> Enable PID (Process ID)". Now you can see which program or service uses which PID and you know what occupies the corresponding port.

If you would like to test ports on your computer, use the Windows command prompt and the CMD command netstat -ano. Windows will show you all currently existing network connections via open ports or open, listening ports that are currently not establishing a connection.

To list what services are listening* on a particular port on a device in your environment, run the following commands in a Windows Command Line or a Linux Terminal window on the device the port is on: Windows: netstat -ano | findstr [Port Number] Linux: netstat -ano | grep [Port Number]

Press the Windows key + R, then type "cmd.exe" and click OK. Enter "telnet + IP address or hostname + port number" (e.g., telnet www.example.com 1723 or telnet 10.17.xxx.xxx 5000) to run the telnet command in Command Prompt and test the TCP port status. If the port is open, only a cursor will show.

If you are experiencing trouble determining what software is using port 80: Run netstat -o from a command prompt. This will output a list of ports and the process ID using the port. In this example, process 4000 is using port 80.

To find open ports on a computer and to check what application is using specified port, use the netstat command line: Open the command prompt (Start > Run > cmd) and use netstat -ano | find /i "<port_number>". It will show you all processes that use the specified port. Notice the PID (process id) in the right column.

Check the physical ports on your computer:

Or within Control Panel open System and Maintenance then Device Manager. Scroll down until you see Universal Serial Bus Controllers and open that. You will see a list of the USB ports installed on your computer.

How do I see what COM ports are in use Windows 10? ›

Step 1: Open the Device Manager. Step 2: From the menu bar, click View. Step 3: Choose “Show hidden devices”. Step 4: From the list of hidden devices, find the Ports (COM & LPT).

You can use "netstat" to check whether a port is available or not. Use the netstat -anp | find "port number" command to find whether a port is occupied by an another process or not. If it is occupied by an another process, it will show the process id of that process.

Execute the command "netstat -a" to view a list of all port numbers.

Use netstat -anob to list all established and listening ports. The command "netstat -anob" shows all in-use ports and the binary (application) which use them.

Checking which application is using a port:

Open the command prompt - start → run → cmd or start → All Programs → Accessories → Command Prompt. Type netstat -aon | findstr '[port_number]' . Replace the [port_number] with the actual port number that you want to check and hit enter.

Open Windows Device Manager. Find "Ports (COM & LPT)" in the list. Expand "Ports (COM & LPT)" to see the names of all serial ports.

Some common ports used by servers or applications are HTTP (80), HTTPS (443), FTP (21), SSH (22), SMTP (25), DNS (53) and Telnet(23). These ports facilitate communication between multiple devices, allowing them to transfer data across the internet.