subfinder

Discover valid subdomains for websites. Designed as a passive framework to be useful for bug bounties and safe for penetration testing. More information: https://github.com/projectdiscovery/subfinder.

subfinder -d example.com

subfinder --silent -d example.com

subfinder -d example.com -b

subfinder -nW -d example.com

subfinder -r 8.8.8.8,1.1.1.1,... -d example.com