Getting Internal/Router IP in PHP/Javascript/etc?

Posted on 2011-09-18
Medium Priority
Last Modified: 2012-05-12
I'm talking about those generic IPs that  router gives out, like or for example. From reading online alot of people state it is impossible, however, 'http://www.whatsmyip.org/more/' will give out the router IP, for example mine, on that website states 'Internal (LAN) IP:', which is correct.

I'm not certain how this can be replicated, I'm not looking for the real IP, I am looking the the internal/router IP. Any suggestions on how this can be achieved?

Right now using basic PHP/Javascript, can call any apache vars if needed too.
Question by:Valleriani
LVL 84

Accepted Solution

Dave Baldwin earned 668 total points
ID: 36557824
It's a server variable, $_SERVER['REMOTE_ADDRESS'].   They are listed there.  This short PHP page will show all the $_SERVER variables that are available from your server.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<title>PHP Server Variables</title>
<body><h1>PHP Server Variables</h1>

foreach($_SERVER as $key => $value) {
    echo "<b>$key :</b> $value<br />\n";
echo "<hr>";
echo "<b>ENVironment variables.</b><br>";
foreach($_ENV as $key => $value) {
    echo "<b>$key :</b> $value<br />\n";


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Assisted Solution

by:Scott Madeira
Scott Madeira earned 668 total points
ID: 36557849
For the internal address you can use the script from this site:


It has a MyAddress.class Java program will get the local IP address (192.168.1.x, for example.)

Here is a link to a demo page that gets the address of your computer.  http://www.reglos.de/myaddress/demo3.html

This is what the whatsmyip.org site uses.

Hope that helps.

Assisted Solution

boon86 earned 664 total points
ID: 36557865

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