retrieve referrer IP address

[usbworkshop]

Hi, I want to know how to retrieve the IP address of the referring HTML page (not visitor address).

This is just for getting the visitor IP address.
echo $HTTP_SERVER_VARS["REMOTE_ADDR"];

Thanks in advance.

[freddydoesphp]

$HTTP_REFERRER is what you are after I believe.

[Son Nguyen]

With that you get the address of the referer and not the IP (but you could just simply extract the domain and look it up -> IPs)