How to get local ip address using javascript?

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Javascript

Hello Everyone,

Is there a way to get the visitors *local* IP-address or Client machine IP address in javascript?

I mean his LAN address like 192.168.1.x, not his regular IP-address like 123.168.xxx.xxx.

I found several approaches that attempt to do this, but they either give me the external (regular) IP address, or they give 127.0.0.1 which doesn't really tell me anything. I need the local machine IP address.

One of Javascript i used is:

<script type="application/javascript">
function getip(json) {
alert(json.ip);
}
</script>
<script type="application/javascript" src="http://jsonip.appspot.com/?callback=getip"> </script>

Thanks in advance.