Tropical PC Solutions: IP sniffer PHP script
This PHP IP sniffer program will sniff out the IP address of your website visitor and email you the information without notifying the visitor. You will need to make sure your PHP installation is configured to handle email functions within the code.
Make sure the document you place this IP sniffer code into has the .php extension and is in a directory in which script execution is allowed.
To download this IP sniffer PHP program click here.