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  • How to extract your outside IP address-without a chicken or a monkey

    Frequently I find myself asking students in my Network+ or Cisco CCNA classes to divulge their favorite resource to use when they want to determine their external (publicly accessible) IP address.

    Here are some of the more popular answers:


    Or perhaps even better, the

    I did not include the actual IP address that I obtained when I was writing this blog, not because it is some big secret, but because I suggest to readers to run the same tests themselves and compare output.  “Compare to what?” you ask.  Well what if I want to know my external IP address, but I want the results from a command prompt?  There is a way, so let’s see it in action.

    This method uses the command prompt, but there is a way to do this in PowerShell as well.  I am not the originator of these methods, but I find them useful enough that I want to throw my voice into the mix and announce them to others who may find them useful also.

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    The command uses nslookup in non-interactive mode and looks like this:


     See figure 4 to see the results:


     Hey!  That is the same address I found using the aforementioned web resources, but I did not have to launch a browser to get it!  Now you  can use that information as input in other scripted activities!

    I did mention that it can also be done in PowerShell, so I will include that here, although I am not a guru on that topic (always willing to learn more…).

    The command and output is

    (Invoke-WebRequest -URI (“”)).Content

    and is shown in figure 5:


    Be aware that it could take up to a minute before the above command generates output, but it does work.  Hope you find this to be a useful tidbit!

    Until next time….

    Mark Jacob
    Cisco and CompTIA Network + Instructor – Interface Technical Training
    Phoenix, AZ

    See what people are saying...

    1. Richard Andersson

      I often use since I by misstake missed the i in the name and now thats where I always land since its the first choice in browser history.

      Works good though, and contains whois history also 🙂

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