Hi there is a bug if you host your website behind a proxy server that the IP addresses of the proxy are only visible to zencart. For me all orders have the IP and that is kind of useless.

So I made a fix to the code (change all of the $_SERVER['REMOTE_ADDR'] to zen_get_ip_address(); )

So If I don't get this fix in ZenCart source three here is te solution replace most of $_SERVER['REMOTE_ADDR'] to zen_get_ip_address(); and copy that function in to the application_top from the admin and the problem is fixed.