4 Easy methods for how to check if port is open on Windows

In this how to check if port is open article, we will try to answer all the how-to questions we receive on our website.

We will add a new question from time to time base on new how to questions that users will ask.

For general question, we will try to answer it for the Windows operation system, assuming it can be asking for Windows, Linux, MAC or Mobile device.

Here is a common question regarding how to check a port is open:

• how to check 443 port open or not?
• how to check if port 443 is open?
• how to check if port 9675 is open?
• how to check port 443 is open?
• how to test port 443 is open?
• how to check if port 25 is open?
• how to check if the port 47827 open?

To check if a port is open or not on your local computer you will have to use a tool.

Using our own Open Port Viewer tool:

You can download our Open Port Viewer tool and run it (right click and run as administrator).

Open Port Viewer is an easy to use GUI tool to get the current list of used ports on your system.

In the list of ports that you will see, please check if you can see the port you are searching.

Using netstat command line tool:

Another option is to use the netstat command line tool.

To do so, please open cmd as administrator:

1. Press the Windows button
2. Type cmd
3. Right click on Command Prompt.
4. Select Run as administrator.

In the command prompt type the following:

netstat -an | find “PORT NUMBER TO FIND”

example to check for 443 with netstat:

netstat -an | find “443”

If you see the port number on the left side (red location on the blow image) the port is open.

Read more information about netstat on our netstat command article.

Using telnet command line tool:

Telnet is also a command line tool, to use it you may have to enable it first, on Windows 10.

This is how you enable telnet on windows 10:

1. Open Turn Windows Feature on or off
   1. Press the Windows Button + R
   1. On the Run dialog type: OptionalFeatures
   1. Press enter or Click OK.
2. Fin Telnet client in the list.
3. Mark V near it.
4. Press Ok

Open the command prompt as administrator (look above how to open cmd as administrator).

Type the following:

telnet localhost <PORT NUMBER>

example to check for 443 with telnet:

telnet localhost 443

If you get the following error, the port is close:

Connecting To localhost…Could not open a connection to the host, on port 443: Connect failed

Using putty tool:

To check if the port is open using putty tool, you need to download putty from the internet first.

Putty can open a terminal, like telnet or SSH to connect to a remote host, like the telnet command.

We will use it to connect a local port.

Downloading putty from putty website – Putty

When the site is open scroll down to the Alternative binary files section.

Select the 32-bit or 64-bit version of the tool, and download it to your computer.

Once it finishes downloading open it.

• Set hostname – localhost
• Set Port – The port number
• Select telnet
• Press open

Example of using putty to check port 443:

If you see the following message the port is close:

In this article, we show you 4 tools that you can use to check if port is open or not.

The above tools are designed to run on Windows operation system and you might need to be an administrator to use them.

Hope it helps.