I know that Amazon has a web service to detect your IP address and another one to detect your network with CIDR notation.
They can be even used just by calling the page from the browser, with a URL, the response is human readable.
I saw the URLs calls using firebug in elasticfox. However elasticfox doesn't work in firefox 4.
So I would like to know, if anyone knows the two URLs or if anyone knows if and how is possible to make elasticfox work with FF4. I know there also the Amazon console, but seems no firewall support. I had to resort writing my firewall application, but I need to detect the user subnet.