Find out what Processes are using a Port Number

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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.

•     Press the Windows Key + R to bring up the Run dialog.
•     Type cmd and press Enter to open the Command Prompt.
•     Select all the text in the box below and press Ctrl + C to copy it:

                             netstat -ano | findstr "80"

•     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).
•     Press Enter to send the command.
•     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.
•     Press Ctrl + Shift + Esc to open the Task Manager.
•     Click the Processes tab.
•     At the top, click View -> Select Columns…
•     Check “PID (Process Identifier)” if it is not already checked.
•     Click OK.
•     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.
•     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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