The most common tool used to display open ports by the app is Sysinternal TCPView. But, again, there is a lot of software available that makes the display of netstat easier to read. The second way to lookup listening ports (in use) by an app is through the help of software. You will now see a result with protocols (TCP or UDP), process names, IP addresses, and port numbers in use by the process. In the Command Prompt window, type the command: netstat -ab Then right-click on the Command Prompt result and click “Run as Administrator”. The first is using netstat.Ĭlick on the Start button. In this article, I will offer you two ways. There are several ways to check open ports used by an app. How to find Ports that are in use by an app in Windows 11 or Windows 10 In this article, you will read how to check the port number used by an app. In general, it is to solve network or Internet problems. There are many reasons one might want to know the port number. By closing or removing the app, you can still use the port for another app.

This is useful, for example, to know which port(s) are in use by which app(s). In Windows, you can look up which app uses which port. It is this port that the app communicates with. Then, it communicates back with “packets.”Ī port number is often put into use by an app to communicate. TCP means Transmission Control Protocol, and its purpose is to send “packets” to another computer, usually a server. If you try to open a TCP port, but this port is in use, then an app on your computer is using this port.Įvery app that connects to the network or Internet in Windows communicates using a protocol.

Windows tcpview