ipify api

<script type="application/javascript">
  function getIP(json) {
    document.write("My public IP address is: ", json.ip);
  }
</script>

<script type="application/javascript" src="https://api.ipify.org?format=jsonp&callback=getIP"></script>

var http = require('http');

http.get({'host': 'api.ipify.org', 'port': 80, 'path': '/'}, function(resp) {
  resp.on('data', function(ip) {
    console.log("My public IP address is: " + ip);
  });
});