Get Client IP using just Javascript?

Question

I need to somehow pull the clients IP address using pure javascript, no server side code, not even SSI.

Any ideas?

I'm not against using a free 3rd party script, if someone can suggest one. This is an emergency stop gap until we can deploy new code.

Answer 1

You can't. And even if you could, it would be the address of the machine, which is useless if they're communicating via a proxy or NAT. Find a way to get it server-side.

Answer 2

Not possible in general unless you use some kind of external service.

Answer 3

Even if you have java available to your JS, the following returns 127.0.0.1 for me, so I'd venture to say "No" as well:

alert(java.net.InetAddress.getLocalHost().getHostAddress());

Answer 4

There isn't really a way.

This goes through some of the possibilities. The code that uses Java will break if the user has multiple interfaces.

http://nanoagent.blogspot.com/2006/09/how-to-find-evaluate-remoteaddrclients.html

Answer 5

I'm no javascript guru, but if its possible you could open an iframe with http://www.whatismyip.com/automation/n09230945.asp as the source and read the content of the frame.

Edit: this wont work because of the cross domain security.

Answer 6

Well, I am digressing from the question, but I had a similar need today and though I couldn't find the ID from the client using Javascript, I did the following.

On the server side: -

<div style="display:none;visibility:hidden" id="uip"><%= Request.UserHostAddress %></div>

Using Javascript

var ip = $get("uip").innerHTML;

I am using ASP.Net Ajax, but you can use getElementById instead of $get().

What's happening is, I've got a hidden div element on the page with the user's IP rendered from the server. Than in Javascript I just load that value.

This might be helpful to some people with a similar requirement like yours (like me while I hadn't figure this out).

Cheers!

Answer 7

You can, relaying it via server side with JSONP

And while googling to find one, found it here on SO http://stackoverflow.com/questions/102605/can-i-lookup-the-ip-address-of-a-hostname-from-javascript

<script type="application/javascript">
    function getip(json){
      alert(json.ip); // alerts the ip address
    }
</script>

<script type="application/javascript" src="http://jsonip.appspot.com/?callback=getip"&gt;&lt;/script&gt;

Answer 8

The last one is jsonpadding tecnique, and is the only possible actually.