DomainTools
DomainTools takes indicators from your network, including domains and IPs, and connects them with nearly every active domain on the internet. These connections help security professionals profile attackers, guide online fraud investigations, and map cyber activity to attacker infrastructure.
References
Here are references that you can use to get started and learn more about whois domaintools :
Tutorials
For some that like to learn from a video tutorial, you can check out tutorials below :