How do I find out the ISP provider of a person viewing a PHP page? Is it possible to use PHP to track or reveal it? If I use something like the following: gethostbyaddr($_SERVER['REMOTE_ADDR']);...

I looked for how to do IP lookup in Java on Stack Overflow but the answers match what I am already doing and do not resolve my problem. Here is my code: public void printHostname( String ip ) { ...

I am trying to reverse dns a list of IPs using socket.gethostbyaddr() in python, which returns 'Unknown Host' for some values, but using dig for the same ip returns the Hostname. Also, dig seems to...