Can a website see my internal IP Address?

Question

I know that websites can access my IP address, but is this IP address the internal (my computer's IP) or are they simply seeing the external (my Internet network's IP address)?

Answer 1

I see this is an old May 2014 post but Michael you are correct to be concerned. WebRTC in your web browser does leak your internal LAN IP address. Using NAT doesn't protect you and neither does using a VPN offer any protection -- because it's your web browser that has the security flaw. I'm using Firefox v61 right now and I confirmed it is leaking my internal IP address (that's how I ended up reading your message here).

Disable WebRTC. Many websites are using WebRTC now to collect/reveal your internal LAN IP address. WebRTC can even be used to scan your internal network. Test if your browser is leaking your ip at https://www.vpninsights.com/webrtc-leak-test