How can I check if an internal port is open?

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Tags

  1. #through
  2. #listening
  3. #column
  4. #computer
  5. #command
  6. #displays
  7. #under
  8. #press
  9. #enter
  10. #netstat
  11. #window
  12. #number
  13. #prompt
  14. #state
  15. #telnet
  16. #ports
  17. #specific