Dmitry is another versatile tool in Kali Linux that is capable of both passive as well as active information gathering. It can perform whois lookups and reverse lookups. It can also search for subdomains, email addresses, and perform port scans as well. It's very easy to use, as shown in the following screenshot:

root@kali:~# dmitry -wn -o output.txt demo.testfire.ne

The preceding command performs whois lookup and retrieves site information from Netcraft and then writes the output to file output.txt.