Created
January 1, 2016 10:52
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Use WebRTC to get an external IP address in JavaScript. https://jsfiddle.net/Nilpo/9qfo46ac/
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title>What is my IP?</title> | |
| </head> | |
| <body> | |
| <p>External IP: <span id="result"></span></p> | |
| <iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe> | |
| <script> | |
| var getExternalIP = new Promise(function(resolve, reject) { | |
| var ips = []; | |
| var ip_dups = {}; | |
| //compatibility for firefox and chrome | |
| var RTCPeerConnection = window.RTCPeerConnection | |
| || window.mozRTCPeerConnection | |
| || window.webkitRTCPeerConnection; | |
| var useWebKit = !!window.webkitRTCPeerConnection; | |
| //bypass naive webrtc blocking using an iframe | |
| if(!RTCPeerConnection){ | |
| //NOTE: you need to have an iframe in the page right above the script tag | |
| // | |
| //<iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe> | |
| //<script>...getIPs called in here... | |
| // | |
| var win = iframe.contentWindow; | |
| RTCPeerConnection = win.RTCPeerConnection | |
| || win.mozRTCPeerConnection | |
| || win.webkitRTCPeerConnection; | |
| useWebKit = !!win.webkitRTCPeerConnection; | |
| } | |
| //minimal requirements for data connection | |
| var mediaConstraints = { | |
| optional: [{RtpDataChannels: true}] | |
| }; | |
| var servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]}; | |
| //construct a new RTCPeerConnection | |
| var pc = new RTCPeerConnection(servers, mediaConstraints); | |
| function handleCandidate(candidate){ | |
| //match just the IP address | |
| var ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/ | |
| var result = ip_regex.exec(candidate); | |
| if(!result) return; | |
| var ip_addr = result[1]; | |
| //remove duplicates | |
| if(ip_dups[ip_addr] === undefined) | |
| ips.push(ip_addr); | |
| ip_dups[ip_addr] = true; | |
| } | |
| //listen for candidate events | |
| pc.onicecandidate = function(ice){ | |
| //skip non-candidate events | |
| if(ice.candidate) | |
| handleCandidate(ice.candidate.candidate); | |
| }; | |
| //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(){}); | |
| }, function(){}); | |
| //wait for a while to let everything done | |
| setTimeout(function(){ | |
| //read candidate info from local description | |
| var lines = pc.localDescription.sdp.split('\n'); | |
| lines.forEach(function(line){ | |
| if(line.indexOf('a=candidate:') === 0) | |
| handleCandidate(line); | |
| }); | |
| resolve( ips.pop() ); | |
| }, 1000); | |
| }); | |
| getExternalIP.then(function(ip){ document.getElementById('result').innerHTML = ip; }); | |
| </script> | |
| </body> | |
| </html> |
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can't read on iphone