Darknet – Hacking Tools, Hacker News & Cyber Security
subfinder – Passive Subdomain Enumeration Tool
subfinder 2.17.0 tested on darknet.org.uk with no API keys: 17 subdomains in 14 seconds, and only one resolved in DNS. What needs keys, and how to install it.
Shown as published in the source's RSS feed. IndiaAIFounders doesn't link out to third-party sites — this is the complete detail available from the feed itself.