Find out what Processes are using a Port Number

To find out what processes are using a particular port number, you can use the following example which looks at Port 80.
You can change the port number by replacing any instances of 80 with your preferred number.

  1. Press the Windows Key + R to bring up the Run dialog.
  2. Type cmd and press Enter to open the Command Prompt.
  3. Select all the text in the box below and press Ctrl + C to copy it:
    netstat -ano | findstr "80"
  4. Right click in the Command Prompt and click Paste.
    • You can delete the “80” and replace it with another number if required but make sure that you keep the quotes in (e.g. “443”, not 443).
  5. Press Enter to send the command.
  6. Five columns of text will be shown. Each row is a connection to the port number.
    Take note of the numbers in the last column as these are PID (Process Identifiers) numbers.
  7. Press Ctrl + Shift + Esc to open the Task Manager.
  8. Click the Processes tab.
  9. At the top, click View -> Select Columns…
  10. Check “PID (Process Identifier)” if it is not already checked.
  11. Click OK.
  12. In the Process list, there will be a PID column. Click on the title of the column to sort the list in order by PID.
  13. Find the “Image Name” in relation to the PID and this will be the application using the Port (e.g. Dropbox.exe or Skype.exe).

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