Port Listener

Port Listener is a simple, lightweight program that allows you to listen to a user-selected port. It provides a user-friendly working environment and can display the results in a separate console.
The program can indicate the applications using the specified port, as well as notify you if the port is forbidden or if any errors occur.
Additionally the application allows you to listen to ports on two different protocols, namely TCP and UDP. If active, the process must be stopped for you to change the protocol option. You can start and stop the listening task at any time, using the dedicated functions.
This is a portable piece of software, so installing Port Listener is not necessary. You can unzip the executable file to any location on the disk and run it directly.
Moreover, you can save Port Listener to an external storage device (such as a USB flash drive) and run it on any computer with minimum effort.
Another important aspect worth mentioning is that the Windows registry does not get entry updates, and files are not left behind on the hard drive after removing the tool.
The interface of Port Listener is based on a small and plain window with a simple layout, where you can input a port number and click a button to listen to it. Details are shown in a secondary panel, the console and you can either copy them to the Clipboard, clear or hide them. The console management options are available from the context menu.
The application minimizes to the system tray area and uses a very low amount of CPU and RAM, so it does not disrupt user activity.
It supports multiple instances, enabling you to listen to different ports at once. All in all, Port Listener comes packed with the necessary and suffice features for listening to ports.