It is completely free, and you can download it on the official website. Launch the PowerShell in Admin mode and paste the following command: Get-WMIObject Win32_SerialPort | Select-Object Name,DeviceID,DescriptionĬlear COM Ports Using COM Name Arbiter ToolĪlso, you can easily delete COM ports with the help of a third-party tool called COM Name Arbiter Setter. Although there is nothing wrong with using the Device Manager, you can check the list using it. There is another way how to check which COM ports are currently in use. Go back to the Reassign COM ports using the Device Manager section and follow it to reassign the port you just made free.

After this, Windows will free a port, so you can assign it to the device you need.

If some specific device occupies several ports simultaneously, you need to remove them altogether

Find the port you need to free and right-click it.

Do not uninstall the devices currently connected Tip: disconnected devices have translucent icons and devices you have plugged in to show a regular icon. Do notice that every device shows which port it occupies.

The next step is to display all COM ports in use.

You need this to delete COM ports in use.

Now you need to force the Device Manager to show disconnected and unavailable devices.

Now, launch the Device Manager using Win + R and devmgmt.msc command.

Set Variable name to devmgr_show_nonpresent_devices and the Variable value to 1.

In the User variables section, click the New button.

In a new window, press the Environment Variables button.

Open your system’s properties and press the Advanced system settings link.

You can manually delete the used COM port and reassign it for a new device. If Windows says the port you need is in use, these instructions won’t work. This will work only if the COM port you need to use is free.

Select a new COM port number from the COM Port Number drop-down list at the bottom of a new window.

In a new window, go to the Port Settings tab and press the Advanced button.

Find the device you need to reassign COM port and right-click it.

Locate the Ports section and expand it.This is a universal command that works in any recent Windows version On your keyboard, press Win + R and enter the devmgmt.msc command.

No com port available