Getting server information
From OpenCms Wiki
You can get a variety of information about your server from OpenCms, however sometimes it is a more round-about route.
Get the Server IP address
To get the IP of the client use the following code. If you use the request object, you most likely will get the proxy IP.
CmsJspActionElement cms = new CmsJspActionElement(pageContext, request, response); out.print(cms.getRequestContext().getRemoteAddress());