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How do I determine which process has TCP ports or UDP ports open?

July 20th, 2004 . by Ali

To display which process ID is using a certain TCP port or UDP port, you can start by using the Netstat command with the n (display in numeric form), o (display the owning process ID–this works on Windows XP only), and a (display all connections and listening ports) switches as follows:

netstat -noa

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This entry was posted on Tuesday, July 20th, 2004 at 1:20 am and is filed under General, Networking, Windows XP. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

One Response to “How do I determine which process has TCP ports or UDP ports open?”

  1. comment number 1 by: Farooq
    June 15th, 2005 at 10:37 am

    Hi Ali
    This is a gr8 command. I want to disable all ports except those that are required on the system on my netowrk. What the best way to do this?

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