One name stands out in this space: (now officially part of the larger Cybernews platform). While premium plans offer deep automation and massive API limits, the Intelx.io Free tier remains one of the most powerful tools available at zero cost.
Security analysts can use the free search to quickly check if an external indicator of compromise (IoC)—like a rogue IP or suspicious domain—has historical ties to known data dumps. Academic Research and Training Intelx.io Free
Intelx.io is a search engine that archives data from the darknet, public data leaks, document sharing platforms, and WHOIS data. Unlike traditional search engines that index the surface web, Intelligence X specializes in "uncovering the hidden"—breached databases, Pastebin leaks, and historical web data. One name stands out in this space: (now