How to get a list of all open ports on Windows 7, Vista and XP?

There is a small freeware Utility called CurrPorts from Nirsoft that displays all open ports on windows.

Download CurrPorts to your computer:

32Bit version: http://www.nirsoft.net/utils/cports.zip

64Bit version: http://www.nirsoft.net/utils/cports-x64.zip

Unpack the .zip file and double click on the file cports.exe to start CurrPorts. The application will show you a list of all open ports and offers the ability to apply filters on the list.