Javascript: How can we get internal IP address without using any third party?

Question

I want to have the internal IP address of my LAN using simple javascript approach.

Without using any third party service.

Answer 1

There's no way to get your IP address with Javascript only. You'll need to rely on a third party service (or retrieve your IP with on your server and return it in the view where your js code is printed).

There's no notion of hosts or ip-addresses in the javascript standard library. So you'll have to access some external service to look up hostnames for you. I recommend hosting a cgi-bin which looks up the ip-address of a hostname and access that via javascript.

Original answer here.

Answer 2

If you want to use ONLY JavaScript and if it's not a problem to do that not browser-side only, you can use NodeJS and Express Framework to make a "micro-web app" which do something like :

app.get('/', function (req, res) {
    var hey = request.connection.remoteAddress;
});

In addition, you can also retrieve a client IP even if it is behind a proxy with :

request.headers['x-forwarded-for']

Interesting link on SO about that here

Maybe it's a bit overkill... Depending of what you wanna do.