How to query a STUN server with JavaScript to get public IP and Port?

Question

I am trying to find some code example to query a STUN server to get my public IP and Port, using JavaScript. Perhaps using the server at

http://www.stunserver.org

While the STUN specification is explained here http://www.ietf.org/rfc/rfc3489.txt ( this is a long document, obviously I don't expect you to read it), I have been unable to find any code example at all, which would make my life easier. Something like

function getMyIPAndPort() {
//query stun server for it
}

Thank you

Answer 1

you can get both local and external IP

 function  determineIPs() {
    const pc = new RTCPeerConnection({ iceServers: [ {urls: 'stun:stun.l.google.com:19302'} ] });
    pc.createDataChannel('');
    pc.createOffer().then(offer => pc.setLocalDescription(offer))
    pc.onicecandidate = (ice) => {
        if (!ice || !ice.candidate || !ice.candidate.candidate) {
          console.log("all done.");
          pc.close();   
          return;
        }
        let split = ice.candidate.candidate.split(" ");
        if (split[7] === "host") {
          console.log(`Local IP : ${split[4]}`);
        } else {
          console.log(`External IP : ${split[4]}`);
         }
    };
  }
determineIPs();

e.g. https://jsbin.com/zosayiyidu/1/edit?js,console

the STUN server is for external IP. make sure you are not behind any proxy that prevents access to stun:stun.l.google.com:19302 or use a different STUN server

Answer 2

Very late answer. Have a look at this mini project: https://diafygi.github.io/webrtc-ips/

It does give you the IP, but doesn't seem to give the port. However, if you look at these lines: //match just the IP address var ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3})/ var ip_addr = ip_regex.exec(candidate)[1];

It seems that they remove the port. I am not sure, but you can play with it to find out.