Get client's private IP

var ipPrivada = "";
function obtenerIPJS(variable) {

		// NOTE: window.RTCPeerConnection is "not a constructor" in FF22/23
		var RTCPeerConnection = /*window.RTCPeerConnection ||*/ window.webkitRTCPeerConnection || window.mozRTCPeerConnection;

		if (RTCPeerConnection) (function () {
		    var rtc = new RTCPeerConnection({iceServers:[]});
		    if (1 || window.mozRTCPeerConnection) {      // FF [and now Chrome!] needs a channel/stream to proceed
		        rtc.createDataChannel('', {reliable:false});
		    };
		    
		    rtc.onicecandidate = function (evt) {
		        // convert the candidate to SDP so we can run it through our general parser
		        // see https://twitter.com/lancestout/status/525796175425720320 for details
		        if (evt.candidate) grepSDP("a="+evt.candidate.candidate, variable);
		    };
		    rtc.createOffer(function (offerDesc) {
		        grepSDP(offerDesc.sdp, variable);
		        rtc.setLocalDescription(offerDesc);
		    }, function (e) { console.warn("offer failed", e); });
		    
		    function updateDisplay(newAddr, variable) {
		    	var varConEval = eval(variable);
		    	if (varConEval != "") varConEval = varConEval+",";
		    	varConEval = varConEval+newAddr;
		    	eval(variable+" = varConEval");
		    }
		    
		    function grepSDP(sdp, variable) {
		        var hosts = [];
		        sdp.split('\r\n').forEach(function (line) { // c.f. http://tools.ietf.org/html/rfc4566#page-39
		            if (~line.indexOf("a=candidate")) {     // http://tools.ietf.org/html/rfc4566#section-5.13
		                var parts = line.split(' '),        // http://tools.ietf.org/html/rfc5245#section-15.1
		                    addr = parts[4],
		                    type = parts[7];
		                if (type === 'host') updateDisplay(addr, variable);
		            } else if (~line.indexOf("c=")) {       // http://tools.ietf.org/html/rfc4566#section-5.7
		                var parts = line.split(' '),
		                    addr = parts[2];
		                updateDisplay(addr, variable);
		            }
		        });
            console.log("varIP"+eval(variable));
		    }
		})(); else {
		}
	}

obtenerIPJS("ipPrivada");