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Is there a command by which I can find my external IP of my router or my NAT\DSL Router, etc., eliminating the need to visit whatsmyip.net or similar.

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on windows that is –  Junaid Saeed Jul 21 '10 at 6:06
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11 Answers

up vote 8 down vote accepted

There is no built-in command to do this. Part of the problem is that when you are connected to the internet through a router, your network hardware is not directly connected to the internet, so your system isn't specifically assigned an IP. It's possible you might even have multiple external IPs in some cases if you are behind a reverse proxy, as many corporate networks are set up. Your best bet might be to create a script which queries whatismyip.org, or trying to find if one already exists.

(As a tip, whatismyip.org is preferable to most other solutions, since it just returns your IP as plain text - no superfluous text, links, images or other garbage. It would be much easier to use in a custom script than most of the other IP-detection sites.)

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They changed whatismyip.org, unfortunately; the IP address is now returned as an image, making it pretty much useless for scripting. The website "icanhazip.com" mentioned below does work. –  onnodb Nov 29 '12 at 13:53
    
Yandex is working, check the script posted below. –  Filipe YaBa Polido Dec 5 '13 at 15:42
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grab your own copy of curlfrom http://curl.haxx.se/download.html and then just

$> curl "http://myexternalip.com/raw"

or use powershell:

$> $wc = new-object System.Net.WebClient
$> $wc.DownloadString("http://myexternalip.com/raw")

(disclaimer: http://myexternalip.com was created by me)

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Create a file named ip.vbs and copy the following into it:

Option Explicit
Dim http : Set http = CreateObject( "MSXML2.ServerXmlHttp" )
http.Open "GET", "http://icanhazip.com", False
http.Send
Wscript.Echo http.responseText   'or do whatever you want with it
Set http = Nothing

Execute using

C:\>cscript ip.vbs

As nhinkle noted, it's best to choose a site that only returns the IP and not HTML + ads, etc. like:

(source: formerly http://externip.com/about)

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I made this batch script to do that a few months ago:

@echo off

:: WhatIsMyIP.cmd - returns public IP address
:: requires: wget.exe

if [%1]==[-h] goto :HELP
if [%1]==[--help] goto :HELP
if [%1]==[/?] goto :HELP

wget -q -O %temp%\MyIP http://www.whatismyip.com/automation/n09230945.asp
for /f "delims= " %%G in (%temp%\myip) do set PublicIP=%%G & del %temp%\MyIP
echo. & echo Your public IP address is %PublicIP% & echo.
if [%1]==[--clip] echo %PublicIP% | clip
goto :EOF

:HELP
echo. & echo Usage: whatismyip [--clip] & echo.
goto :EOF

:EOF

It gives you the option to put the IP address in the clipboard and it sets an environmental variable - %PublicIP%.


SIMPLER METHOD:

Now, I just do this instead:

curl icanhazip.com

or...

curl icanhazip.com | clip

...to get the current public IP address into the clipboard.

You need cURL.

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Try this:
Doesn't need any kind of external software installed.

@set @script=0 /*
  @echo off
    set @script=
    cscript //nologo //e:jscript "%~dpnx0"
  exit /b
*/

with (new ActiveXObject('Microsoft.XMLHTTP')) {
   open('GET', 'http://internet.yandex.ru/', false);
   send();

   WScript.echo(responseText.match(/IPv4:\s(\d+\.){3}\d+/g));
}
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The script from paradroid worked fine but whatsmyip moved the web page to http://automation.whatismyip.com/n09230945.asp

If you change to this, it works perfect.

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Without third party programs is hard on Windows as Telnet isn't supplied by default, but, if it is there (XP) or turned on (Windows Vista and above), simply type:

telnet curlmyip.com 80

the screen will flash, and you will just get a cursor... Next type:

GET

In capital letters... you will then see the headers, followed by your ip (and sorry I blurred it, just showing where it would be!):

enter image description here

Other answers here obviously work, but, I'm trying to keep to the question on something that can be used on any windows, without third party programs!

For Windows Vista and above, you can install telnet easily (and safely) through Programs and features, or use the following command:

pkgmgr /iu:”TelnetClient”
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That (and most of the answers!) does assume that the source website picks up your ip address accurately - some types of proxies mess this up. I was scraping my ip address off my router cause of this. Interestingly, in these cases, a website that uses a non standard port may work fine. –  Journeyman Geek Jan 15 at 1:21
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For IPv4:
$tmp =Invoke-WebRequest -URI http://myip.dnsomatic.com/
$tmp.Content

For IPv6:
$tmp =Invoke-WebRequest -URI http://myexternalip.com/raw
$tmp.Content

This will give you a variable to work with if you have something specific you want to do with it. I'm actually using this to build a script to upload my router's dynamic IP periodically, have another machine test communication to it at regular intervals, and then update DNS with the latest IP if it has changed so I can access my gear from anywhere by using a name instead of having to constantly chase down the IP.

And of course - as the sites change or their outputs change you'll want to update this accordingly. :)

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Are you able to log into your router? Should find the info there, like on a Status page.

Using a Mozilla browser & NoScript? NoScript Options | Advanced | ABE -> WAN IP.

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I also had same problem and because i didn't find any solution I wrote purpose .net command line application. It is free, you can download it here. Application uses same approach as is shown in these answers but because it is designed for this purpose is much more reliable (it can use more more external web pages at once and so). Source is visible using reflection.

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You could use a DNS request instead of HTTP request to find out your public IP:

C:\> nslookup myip.opendns.com resolver1.opendns.com

It uses resolver1.opendns.com dns server to resolve the magical myip.opendns.com hostname to your ip address.

Unix version:

$ dig +short myip.opendns.com @resolver1.opendns.com
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