WHOIS

WHOIS is a query and response protocol widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system number. These databases provide information like the registrant's contact details, creation and expiration dates, registrar information, and nameservers associated with the resource. While primarily used for technical and administrative purposes, WHOIS data can be valuable for identifying potential sources of abuse, tracking down malicious actors, or verifying the legitimacy of online resources.

Visit the following resources to learn more:

• @article@How to use the whois command on Linux
• @article@Whois lookup
• @video@Passive Reconnaissance - Whois Lookup Tutorial