How to check port occupancy in Windows

As one of the most common operating systems currently, Windows is widely used in personal, corporate and academic fields. For applications running on Windows, ports are key to communicating with the outside world. Ports are used to identify which application or process is using a specific communication port in a network protocol. This will be very useful in some cases when we need to view the port occupancy on Windows systems. This article will introduce some commonly used methods and tools to check port occupancy on Windows systems.

1. Using the command prompt (cmd)

The command prompt (cmd) that comes with the Windows system is a convenient tool for viewing and managing the system. You can use it to view port occupancy. Here are the steps to use the command prompt to view port usage:

1. Open the command prompt. In the Windows taskbar's search bar, type "cmd" (without the quotes) and select the Command Prompt application.

2. Enter the following command:

netstat -ano

This command will display all ports in use and their corresponding process IDs.

3. Find a specific port. If you only want to view the occupancy of a specific port, you can modify the command to:

netstat -ano | findstr " "

Replace " ” with the port number you want to view.

4. Find the process ID. In the command output, you will see a column of ID numbers named "PID". These are unique numeric identifiers associated with each process.

5. Associated process ID. To view the details of a program or process using a specific process ID, you can use the following command:

tasklist | findstr " "

Replace " " The specific process ID you want to query.

2. Use the Resource Monitor

The Resource Monitor is an advanced performance monitoring tool that comes with the Windows system. It can provide detailed system resource usage, including network connections. and port occupancy. Here are the steps to use Resource Monitor to view port usage:

1. Open Resource Monitor. In the Windows taskbar's search bar, type "Resource Monitor" (without the quotes) and select the Resource Monitor application.

2. In the Resource Monitor menu bar, select the Network tab.

3. In the Network tab, you will see a list of all currently connected network connections.

4. Click the "Listening Port" column header to sort connections by port number, making it easier to find the occupancy of a specific port.

5. In the corresponding line, you will see the name and ID of the process that is using that specific port.

3. Use third-party tools

In addition to the command prompt and resource monitor that come with the Windows system, there are many third-party tools that can be used to view Port occupancy on Windows systems. For example, tools such as TCPView and CurrPorts provide intuitive and easy-to-use interfaces and can display all currently open TCP/IP and UDP ports and corresponding processes.

Summary

By using Command Prompt, Resource Monitor, and appropriate third-party tools, you can easily view port occupancy on your Windows system. This is important for troubleshooting network connectivity issues, ensuring that applications are functioning properly, and for enhancing system security. Whether you are an ordinary user or a system administrator, mastering these methods and tools will be helpful to you. I hope this article will help you understand how to check port occupancy in Windows systems .

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