How to Find Out List of All Open Ports in Linux

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Aaron Kili

Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge.

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10 Responses

  1. Reyaz Hossan says:

    Awesome post and informative.

    Thanks a lot

    If you don’t mind I can share some addition info with this post.

    If you want to find the port list of oracle application and database in Linux system use the following command.

    # cat $ORACLE_HOME/install/portlist.ini

    Else, you can follow this guide to find out Oracle ports:

    Thanks again…

  2. Mike Schwartz says:

    I use `netstat -antlp | grep LISTEN`

    I remember “ant” and “lp” options for some reason it sticks in my brain.

    • Aaron Kili says:


      Thanks for sharing, I use a similar command to find process listening on a port like this:

      $ sudo netstat -tnlp | grep -w "PORT_HERE"


      • -t – consider tcp ports.
      • -l – display only listening sockets.
      • -n – show numerical addresses.
      • -p – show the PID and name of the program socket belongs to.
  3. Chris Pesoa says:

    Nice article, can I suggest using:

    # netstat -lntup
    # ss -lntup

    instead of:

    # netstat -lntu
    # ss -lntu

    The -p option will show the process/daemon/user/PID who opened the port.

    Again, nice article!


  4. Martins Almeida says:

    “a port is a logical entity which acts as a endpoint of communication to identify a given application or process on an Linux operating system”. A port does not identify any application or process as the same port can be used by different applications or processes. More correct would be to use the words “is associated with” or “used by” insted. Regards.

  5. krankes-kind says:

    I guess in most occasions it would be good to add -p to display also the process which is listening on the respective port

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