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Whois is a free service that provides the contact details of a domain name holder as well as other information related to its associated web hosting, if applicable. Many services offer whois searches, such as whois.net. However, this information is not always reliable, as some domain name holders choose not to make their information public or provide incorrect data.
Having become unsuitable for the modern web and developments such as GDPR, whois has been replaced by a protocol called Registration Data Access Protocol (RDAP).
Whoisology – Advanced domain and whois searches: reverse whois, domain names and their holders containing a string, whois history, etc.
Microsoft Defender Threat Intelligence - cybersecurity platform with data on malicious infrastructure (IPs, domains, URLs) to monitor, analyze, and anticipate threats.
ViewDNS.info – Complete and free set of whois tools: history, reverse whois, etc.
DomainIQ – Current and historical whois data, with cross-referencing of other domains by the same holder, other domains on the same IP, etc.
Whois Domaintools – Complete whois data for all extensions, with information on other major registered TLDs
Bulkseotools.com/bulk-whois-lookup.php – Whois data for large lists of websites