Browser support

[Richienb]

At least the asynchronous part, in theory, should be possible.

Here's my browser implementation of internalIp.v4().

[sindresorhus]

What's the use-case? The use-case is clear for servers, but in what situations would you need this in the browser?

[kl3sk]

For example, hide or show some website part for a specific IP (in a internal app).
This is a use case I want to implement.

[Richienb]

What's the use-case?

Doing this sort of thing has gained traction in a StackOverflow question:

https://stackoverflow.com/q/20194722/8384910

[sindresorhus]

Alright. PR welcome.

[silverwind]

Wort mentioning, some software blocks this method as it's considered a privacy issue:

https://github.com/gorhill/uBlock/wiki/Prevent-WebRTC-from-leaking-local-IP-address