Is there a way to get the visitors *local* IP-address in javascript? I mean his LAN address like 192.168.1.x, not his regular IP-address.

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 network address.

Just an alert saying "your machine's local network IP is 10.0.0.139" would be great.