https://domainscan.tools/ja/tools/subdomain-finder
Free Subdomain Finder - DNS-Verified from CT Logs
Find public subdomains of any domain with certificate transparency and DNS checks. No signup, CSV export. Spot forgotten hosts and takeover risks.
ct logsfreesubdomainfinderdns
https://iweek.org.za/sessions/certificate-transparency-running-static-ct-logs
Certificate Transparency: Running Static CT Logs | iWeek
certificate transparencyct logsrunningstaticiweek
https://ctl.shodan.io/
Shodan CT Logs API
ct logsshodanapi