Bug bounty hunters use Intelx to find forgotten subdomains that may be vulnerable.
The free tier grants access to this same massive index, albeit with restrictions designed to prevent API abuse. Intelx.io Free
Disclaimer: This article is for educational purposes only. Do not access data that does not belong to you or for which you do not have explicit permission. The author is not responsible for how you use Intelx.io. Bug bounty hunters use Intelx to find forgotten