Windows 8 and 8.1 Forums


Why is my port 53 open?

  1. #1


    Posts : 70
    windows 8.1

    Why is my port 53 open?


    I know port 53 is for DNS, but I can't seem to find out why it would just be open all the time. GRC lists that as my one open port on shields up!
    can someone explain why for me?

      My System SpecsSystem Spec

  2. #2


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    Something was probably using it at the time you ran the scan. It is a port used by DNS. Most likely just the computer talking to the router or another computer on the network. Here is the list for future reference. List of TCP and UDP port numbers - Wikipedia, the free encyclopedia Personally I would not pay any attention to what GRC shows.
      My System SpecsSystem Spec

  3. #3


    Posts : 70
    windows 8.1


    Thanks for the response, broe23. I've heard that about Steve Gibson, and was told he has useful tools but that I should take his interpretation of results with a grain or 2 of salt. What I was worried about was the fact that it's persistently open while on line, after checking back periodically. Should it close when not being used, or should it be open all the time? Thanks again!
      My System SpecsSystem Spec

  4. #4


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    It pretty much stays open all of the time when you are connected to a LAN.
      My System SpecsSystem Spec

  5. #5


    The part that the GRC website tends to leave out, is that an open port on its own doesn't compromise your system's security in any way. You can open up every single port there is and it won't make a bit of difference in and of itself. You need the second element, which is some program LISTENING on one of those ports before you have the potential for a security problem. That program also needs to have some means of being exploited, but that still falls generally within the realm of the program needing to be present.

    There's good reason Steve Gibson is the butt of so many jokes and the general laughing stock of the computer security community. He tends to rush in with these chicken little the sky is falling claims that are based on, at best, a half-assed analysis which completely misses some more plausible explanations. Maybe the guy has finally learned his lesson. The last time I remember seeing his name is when he claimed that Microsoft put an intentional back door into XP's GDI+ library. A couple of days later, after everyone else had had time to evaluate things, turns out it wasn't even remotely what he claimed. I forget if he did stumble across a legitimate security issue, which Microsoft quickly patched, or if it ended up just being something completely innocuous, but haven't seen much from the guy since.
      My System SpecsSystem Spec

Why is my port 53 open?
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