In summary, when a domain name is unavailable, I: Visit the domain to check its status. Use WHOIS to find the owner’s details ...

Another option is to use a WHOIS lookup service, which is a database that keeps track of domain name registration information, including the name and contact information of the domain registrant.

Therefore, examining the current and historical WHOIS details of NRDs and comparing ... an email address used to register one of the domain IoCs was linked to more than 25 other domains registered ...