<script>
      $.ajax({
        url: "http://ipv6.getmyip.ninja",
        cache: false
      })
      .done(function( data ) {
        $('#lead').html('<p id="lead" class="lead">We\'ve also found this IPv6 address: ' + data + '</p>');
      })
      .fail(function ( data ) {
        $('#lead').html('<p id="lead" class="lead">No IPv6 address was found.</p>');
      });
  </script>