The REMOTE_ADDR.shtml web page shows your IP address.
How is this done?
The trick is to use a .shtml file on a web server, such as Apache or a Microsoft web server which supports .shtml. The web page makes use of the SHTML environment variables and makes a web page which just has this in it. Here is the contents of the REMOTE_ADDR.shtml file in plain text.
<html><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <title>Get External IP Address</title> </head> <body> <!--#echo var="REMOTE_ADDR" --> </body></html>
For a list of a bunch of other variables, see: