<script type="text/javascript"> /** * Get the user IP throught the webkitRTCPeerConnection * @param onNewIP {Function} listener function to expose the IP locally * @return undefined */ function getUserIP(onNewIP) { // onNewIp - your listener function for new IPs //compatibility for firefox and chrome var myPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection; var pc = new myPeerConnection({ iceServers: [] }), noop = function() {}, localIPs = {}, ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g, key; function iterateIP(ip) { if (!localIPs[ip]) onNewIP(ip); localIPs[ip] = true; } //create a bogus data channel pc.createDataChannel(""); // create offer and set local description pc.createOffer().then(function(sdp) { sdp.sdp.split(\'\n\').forEach(function(line) { if (line.indexOf(\'candidate\') < 0) return; line.match(ipRegex).forEach(iterateIP); }); pc.setLocalDescription(sdp, noop, noop); }).catch(function(reason) { // An error occurred, so handle the failure to connect }); //listen for candidate events pc.onicecandidate = function(ice) { if (!ice || !ice.candidate || !ice.candidate.candidate || !ice.candidate.candidate.match(ipRegex)) return; ice.candidate.candidate.match(ipRegex).forEach(iterateIP); }; } // Usage getUserIP(function(ip){ alert("Got IP! :" + ip); }); </script>