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How and from where websites like this http://www.yougetsignal.com/tools/web-sites-on-web-server/ are getting this information from? How can I develop such tool?
Thank you.
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ABOUT REVERSE LOOKUPIf you type in an IP address, we will attempt to locate a dns PTR record for that IP address. You can then click on the results to find out more about that IP Address. Please note that in general, your ISP must setup and maintain these Reverse DNS records (i.e. PTR records) for you.
A reverse IP domain check takes a domain name or IP address pointing to a web server and searches for other sites known to be hosted on that same web server. Data is gathered from search engine results, which are not guaranteed to be complete.
But with the reverse DNS lookup command, you query the IP address to find the hostname. Therefore, by entering the IP address into the reverse lookup tool, you are able to find the domain name associated with the corresponding IP. For example, one IP address of Google.com is 74.125.
You can use nslookup on the IP. Reverse DNS is defined with the .in-addr.arpa domain.
Example:
nslookup somedomain.com yields 123.21.2.3, and then you do:
nslookup 123.21.2.3 this will ask 3.2.21.123.in-addr.arpa and yield the domain name (if there is one defined for reverse DNS).
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You can use ping -a <ip> or nbtstat -A <ip>
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