An open port allows network packets through its channels and is integral for surfing on websites or communication with servers. If a necessary port is closed, it can prevent those packets from reaching the computer and vice versa, unable to provide information you so desire. However, ports can be opened and closed at will. If you want to check the status of a port, how would you do it?
It just so happens there’s several methods for checking whether or not a port is open, either by a website, commands or through Windows’ own environment. It will only take a few moments to answer.
Check For Open Ports With a Website
Websites like CanYouSeeMe can give you a quick answer on whether or not a specific port is currently opened. When you visit the site, you’ll see your IP listen, as well as a blank ‘Port to Check’ field. All it takes is punching in the specific port number and clicking ‘Check Port.’ Not sure which port to check? It even provides a list of common ports.
Of course, CanYouSeeMe isn’t the only website that provides this service. You are welcome to find others.
Check For Open Ports With Windows Firewall
Windows Firewall is a great alternative if you want to know whether or not certain applications have a path through, especially on public networks.
1. Open Windows Start menu and search with ‘firewall.’ When Windows Defender Firewall appears in the search result, click on it.
2. In the left-hand column, click ‘Allow an app or feature through Windows Defender Firewall.’
3. From here you have the opportunity to view ports that are opened and, if you so choose, can change it by clicking ‘Change Settings.’ It’s in the top-right corner.
Check For Open Ports With Command Prompt
For those of you who like the environment of Command Prompt, there’s a handful of commands that you can use to check for open ports.
1. Open the Windows Start menu and search for Command Prompt. You want to run it as an administrator.
2. The very first command you’re using is ipconfig. Punch it in and hit the Enter key. Write down your IP address.
3. Now, for the next command: telnet. Hit the Enter key. In doing so, you open Microsoft Telnet.
Note: If Command Prompt tells you it doesn’t recognize the command, you need to enable it in Windows features.
4. Use this command: open ip address, followed by the port number. For example: open 10.0.0.0 50.
The Command Prompt will provide you with two answers, either it will ask you to press any key to continue or ‘Could not open connection.’ The former means the port is open and the latter means the port is closed.
Out of the three options available, Windows Defender FIrewall is arguably the most user-friendly. You don’t have to necessarily know what port you’re looking for, just that you know certain ports are opened or closed. However, if you want a clue on a port you’re familiar with, the Command Prompt is the better option.