The script on this page will attempt to find your local ip addresses, using HTML5 WebRTC, and then use that info to probe your lan(s) with a shellshock payload.
As provided it should work with Chrome and Firefox on Windows and OS X. Chromium on Linux does not work, Firefox reportedly does.
This is mostly code pinched from @einaros
https://dl.dropboxusercontent.com/u/1878671/enumhosts.html
With some grotty bodges by me to make the code send xmlhttprequest's to the internal lan with a shellshock ping payload in the Accept and Accept-Language headers. Firefox/Chrome wont allow you to override the User-Agent, Host or Accept-Encoding for xmlhttprequest's
For testing I used a vulnerable VM from www.pentesterlab.com running in VMware a description of using this VM can be found here
Your local ips appear to be:
Other boxes on your LAN possibly include (this will take some time ..):