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What ports are blocked on my network?
Enter "telnet + IP address or hostname + port number" (e.g., telnet www.example.com 1723 or telnet 10.17. xxx. xxx 5000) to run the telnet command in Command Prompt and test the TCP port status. If the port is open, only a cursor will show.
How can I test if a port is open?
Testing ports with the command prompt If you would like to test ports on your computer, use the Windows command prompt and the CMD command netstat -ano. Windows will show you all currently existing network connections via open ports or open, listening ports that are currently not establishing a connection.
How to check open ports from cmd?
Start up the command prompt. Type ipconfig. Type netstat -a for a list of all port numbers.