How to find out the server IP address (using JavaScript) that the browser is connected to?

Try this as a shortcut, not as a definitive solution (see comments):

<script type="text/javascript">
    var ip = location.host;
    alert(ip);
</script>

This solution cannot work in some scenarios but it can help for quick testing. Regards

Fairly certain this cannot be done. However you could use your preferred server-side language to print the server's IP to the client, and then use it however you like. For example, in PHP:

<script type="text/javascript">
    var ip = "<?php echo $_SERVER['SERVER_ADDR']; ?>";
    alert(ip);
</script>

This depends on your server's security setup though - some may block this.

Not sure how to get the IP address specifically, but the location object provides part of the answer.

e.g. these variables might be helpful:

• self.location.host - Sets or retrieves the hostname and port number of the location
• self.location.hostname - Sets or retrieves the host name part of the location or URL.