Most startlingly, this technique can not only be used to get your IP address, but can be turned into a sort of " nmap " like tool; to scan your entire internal network.
How does this detection work?
This is particularly troubling for businesses and universities. It means that if you visit a malicious website, you could inadvertently leak details such as the internal network structure to attackers. It is possible to diable WebRTC in some web browsers.
One day we'll have a guide about how to do this. If you have any more questions, use the contact form and we'll answer it and add your question here. What is my local IP Address?
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How-To Find Your Local IP Address In Windows 7 or Vista
The public IP address of your network is a unique number assigned by Google Fiber. All incoming and outgoing traffic such as email, texts, web searches, and so on uses that externally facing public IP address.
The internal IP address of a device on your network is a unique number in a series that is assigned by the Network Box when that device connects to your Google Fiber home network. The Network Box assigns IP addresses in numerical order for example, So the IP address of a particular device is not necessarily the same every time it connects.
Generally, you do not need to know the IP address of a device. However, you can determine the IP address of any device on your network or your public IP address, if you care to do so. Select Network at the top-left corner. Your Google Fiber devices appear on the navigation pane on the left, and the configuration options appear on the right.
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Technical details about that device appear in the settings pane on the right. The IPv4 address is the common form of IP address. If an IPv6 address has been assigned to the device, that address is also listed.