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//get the IP addresses associated with an account

function getIPs(callback){

    var ip_dups = {};

    //compatibility for firefox and chrome

    var RTCPeerConnection = window.RTCPeerConnection

        || window.mozRTCPeerConnection

        || window.webkitRTCPeerConnection;

    var mediaConstraints = {

        optional: [{RtpDataChannels: true}]

    };

    //firefox already has a default stun server in about:config

    //    media.peerconnection.default_iceservers =

    //    [{"url": "stun:stun.services.mozilla.com"}]

    var servers = undefined;

    //add same stun server for chrome

    if(window.webkitRTCPeerConnection)

        servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]};

    //construct a new RTCPeerConnection

    var pc = new RTCPeerConnection(servers, mediaConstraints);

    //listen for candidate events

    pc.onicecandidate = function(ice){

        //skip non-candidate events

        if(ice.candidate){

            //match just the IP address

            var ip_regex = /([0-9]{1,3}(/.[0-9]{1,3}){3})/

            var ip_addr = ip_regex.exec(ice.candidate.candidate)[1];

            //remove duplicates

            if(ip_dups[ip_addr] === undefined)

                callback(ip_addr);

            ip_dups[ip_addr] = true;

        }

    };

    //create a bogus data channel

    pc.createDataChannel("");

    //create an offer sdp

    pc.createOffer(function(result){

        //trigger the stun server request

        pc.setLocalDescription(result, function(){});

    }, function(){});

}

//Test: Print the IP addresses into the console

getIPs(function(ip){console.log(ip);});