How to check if the port is open in windows

Windows method to check whether the port is open: 1. Use command prompt or PowerShell; 2. Use firewall settings; 3. Use third-party tools.

#In Windows operating systems, there are different methods to see if a port is open. The following are some commonly used methods:

1. Use Command Prompt or PowerShell

to open the Command Prompt (or PowerShell) window and enter one of the following commands First, check whether the port is open:

a) Use the `netstat` command to view the ports on which connections have been established:

netstat-ano

This command will display all port information on which connections have been established. You can check `Local Address` column to confirm whether the port is open. If the port is in use, you can also find the process ID occupying the port in the `PID` column.

b) Use the `telnet` command to test whether a specific port is open:

telnet

For example, to test whether port 80 is open, you can run the following Command:

telnet127.0.0.180

If "Connected" is displayed on the command line, it means that the port is open.

Note: In the latest version of Windows, the Telnet client is not installed by default. If you encounter "telnet "Not an internal or external command..." error, please install the Telnet client manually. You can find the "Turn Windows features on or off" option in the "Programs and Features" tab of the Control Panel, and check Telnet here. Just the client.

2. Use firewall settings

Windows operating systems usually come with built-in firewall functionality. You can determine if a port is blocked or allowed by checking your firewall settings. Here are the steps to view your firewall settings:

a) Open Control Panel and select the "Windows Defender Firewall" (or "Windows Firewall") option.

b) In the left panel, select "Advanced settings".

c) In the newly opened window, click "Inbound Rules".

d) In the right window, you can see all configured inbound rules. Find a specific port by scrolling or using the search function, then check the status of the port (whether it is allowed, blocked, or disabled by a rule).

3. Use third-party tools

In addition to the above methods, you can also use some third-party tools to check whether the port is open. The following are some commonly used tools:

a) PortQry: PortQry is a command line tool provided by Microsoft that can be used to query the status of a specific port. The tool can be downloaded and used.

b) Nmap: Nmap is an open source network detection and security assessment tool. It can scan hosts and ports in the network and provide detailed host and service information.

Summary:

You can easily check whether a port is open in your Windows operating system through the command prompt (or PowerShell), firewall settings, or third-party tools. Whether you're looking at the ports that have established connections or want to test the status of a specific port, the above methods can help you get the job done. .

The above is the detailed content of How to check if the port is open in windows. For more information, please follow other related articles on the PHP Chinese website!