Can JavaScript Reveal Your Local LAN IP Address Using WebRTC?

Can JavaScript Reveal Your Local LAN IP Address?

Traditionally, obtaining a user's local LAN IP address via JavaScript was considered impossible. However, the advent of the WebRTC extension in HTML5 has changed this.

WebRTC allows JavaScript to query the local client IP address. A demonstration can be found at http://net.ipcalf.com.

Interestingly, this feature is not a bug but a deliberate design choice. Nonetheless, its privacy implications raise concerns.

For informational purposes, displaying the IP address to the user may be acceptable. However, it's important to use caution and acknowledge the privacy implications. The WebRTC extension provides a straightforward solution for this specific scenario, allowing the browser to expose IP address information to the user without using Java applets or Flash objects.

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