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This wikiHow teaches you how to determine if a specific port on a computer or network is open.
Steps
Check external port
Go to http://www.canyouseeme.org using a web browser. You can use this website if the port belongs to a computer or network with Internet access. The website will automatically detect the user’s IP address and display it in the “Your IP” box.
- There are different pages where you can check open ports. If you want, you can use the keyword “open port check top” on a common search engine to find alternatives.
Enter port. Enter the port you want to check (for example, 22 for SSH) in the “Port to Check” box.
Click Check Port . If the port is open and available, a confirmation message will appear. Otherwise, you will see the error message “Error: I could not see your service on (your IP address) on port (port number)”.
Check if the application is allowed to pass through the Windows firewall
Open the Windows search engine and type firewall . If the search bar isn’t already open, click the circle or magnifying glass to the right of the Start menu.
- Apply this method if you want to check to see if Windows is set up to allow apps you installed through the firewall.
- Windows Firewall is enabled by default. If you have your own firewall software installed, it can be used to check if the application is allowed through.
Click Windows Defender Firewall . Firewall and Network Protection settings will open.
Click Allow an app through firewall . This is one of the text links located near the bottom of the window. A list of applications allowed through the firewall will appear.
- If the app only breaks through the firewall when you’re connected to a network marked “private” (such as when your computer connects to your home network), a checkmark will appear in the “Private” column next to the app .
- If the application gets through the firewall when you connect to a public network, a checkmark will appear in the “Public” column.
Allow unlisted applications or ports to pass through the firewall. If you don’t see the app you’re looking for in the “Allowed apps and features” list, click the Change Settings button in the upper-right corner, then proceed with the steps below. following steps:
- Click Allow other apps near the bottom.
- Click Browse , select the app, and then click Open .
- Click Network Types near the bottom left corner, choose privacy preferences, and click OK .
- Click Add to add the app and select OK .
Check if an application is allowed to pass through the Mac firewall
Click menu
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and select System Preferences . By default, the Mac firewall is not enabled. [1] X Research Source
Click Security & Privacy . This option has a house icon and is located in the top row.
Click the Firewall tab near the top center of the window.
- If the message “Firewall:On” appears near the top of this tab, the firewall is active.
- If the firewall isn’t working and you want to enable it, click the padlock icon in the bottom left of the window, enter your administrator password, and then click Turn On Firewall .
Click Firewall Options . Settings will open, which includes a list of apps and services to set whether or not to allow incoming connections.
- If the app or service shows a blue dot and the words “Allow incoming connections”, it means the port is open.
- If you see a red dot with “Block incoming connections” status, the port is closed.
- You can toggle the port’s status to allowed or disallowed by clicking the double arrow icon next to the app’s current state and then selecting an action.
Check if the local router port is open (Windows)
Enable Telnet on Windows. You can use Telnet to check if a particular port is open on your router (router) or access port. Here’s how to enable the port:
- Type windows features in the search bar. If you don’t see the search bar, you can click the circle or magnifying glass to the right of the Start menu.
- Click Turn Windows features on or off .
- Check the box next to Telnet Client and select OK .
- Click Close when the application is finished installing.
Open the command line by:
- Type cmd in the Windows search bar.
- Click Command prompt in the search results.
Type ipconfig at the command prompt and press ↵ Enter . A series of network information will appear.
Record the router IP address. The address displayed next to the “Default Gateway” line in the ipconfig results is the router’s local address.
Type telnet at the command prompt and then press ↵ Enter . The Microsoft Telnet command prompt will open.
Type open (router IP address) (port number) . For example, if you want to see if port 25 is open on the router (the router IP address is 10.0.0.1), you need to type open 10.0.0.1 25 .
Press ↵ Enter . Telnet will try to connect to the port.
- If the message “Please press Enter” or “Press any key to continue” appears, the port is open.
- If the message “Could not open connection” appears, this port is closed.
Check if the local router is open (Mac)
Open a Terminal window. To do so, open Spotlight by clicking the magnifying glass icon in the upper-right corner of the screen, typing terminal , and then clicking Terminal from within the search results.
- Apply this method to check if a certain port is open on the local router or access point.
Enter netstat –nr &# 124; grep default at the command prompt and then press ⏎ Return . The router IP address will appear next to the “default” line at the top of the search results.
Type nc –vz (router IP address) (port) . For example, with the IP address of 10.0.0.1 and you want to check if port 25 is open on the router, enter netcat 10.0.0.1 25 . [2] X Research Source
Press ⏎ Return . Here’s how to analyze the results: [3] X Research Sources
- If the port is open, you will see a message saying the connection was successful.
- If the port is closed, you’ll see a message saying the connection was refused or timed out.
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 27,991 times.
This wikiHow teaches you how to determine if a specific port on a computer or network is open.
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