Explore the process of building a comprehensive WHOIS dataset for reconnaissance in this 23-minute conference talk from BSidesLV. Discover the challenges of accessing WHOIS data, including rate limits, third-party APIs, and expensive bulk purchases. Learn about creating a 15 million+ WHOIS dataset, setting up notifications for newly acquired domains, understanding WHOIS and RDAP intricacies, and searching for archival WHOIS data. Gain insights into open-source tools that complement this process, enhancing your OSINT and penetration testing capabilities.