Can JavaScript Really Access a User\'s Local LAN IP Address?

Accessing a User's Local LAN IP Address with JavaScript

Despite the common misconception, it is now possible to obtain a user's local LAN IP address using JavaScript alone. This capability is a result of the WebRTC extension introduced in HTML5.

To demonstrate the functionality, consider the proof of concept available at http://net.ipcalf.com. This website harnesses the WebRTC extension to retrieve a user's local IP address.

The inclusion of this feature in HTML5 was an intentional design decision, not a bug. However, given its potential for misuse, it is advisable to approach it with caution. Nonetheless, for the purpose of displaying the user's exposed information, it serves its purpose effectively.

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