IPAddressToEmailAddress Whois

From Paterva Wiki

This transform performs a recursive whois query on the IP address (obviously not the domain!) and parses the output for email addresses. The idea with the transform is to provide the email address of the owner of the network where this IP address resides. Keep in mind that in many cases smaller blocks of IP addresses are sub leased and that the whois information might not reflect this. This can easily lead to false positives. The whois information itself is stored as a property of the IP address entity ('IP whois'). You should always manually inspect this data to give context to results. For more information about whois see the Wikipedia entry here [1].