WebRTC is a communication protocol that relies on JavaScript that can leak your actual IP address from behind your VPN. While software like NoScript prevents this, it's probably a good idea to block this protocol directly as well, just to be safe. This page will test if your internet browser is affected by the WebRTC Leak.
This demo secretly makes requests to STUN servers that can log your request. These requests do not show up in developer consoles and cannot be blocked by browser plugins like AdBlock, Ghostery, etc.
Your local IP addresses:
Your browser is not safe and will show your real IP even though you are using a VPN service if you can see your real IP addresses here.