Your IP Address is:
18.206.92.240
PHP:
Read more on the $_SERVER variable.
$ip_address = $_SERVER['REMOTE_ADDR'];
JavaScript:
You need to call a server-side script to accomplish this. First create a PHP file on your server and paste this in it:
<?php
header('content-type: application/json; charset=utf-8');
$data = json_encode($_SERVER['REMOTE_ADDR']);
echo $_GET['callback'] . '(' . $data . ');';
Next, use this JavaScript to call the PHP file you created above.
<script type="application/javascript">
function getip(json){
alert(json); // alerts the ip address
}
</script>
<script type="application/javascript" src="http://www.anotherdomain.com/file.php?callback=getip" ></script>