Is this a brute-force subdomain scanner?

No. It only searches Certificate Transparency logs via crt.sh. Discovered hosts are not probed.

Why might results be incomplete?

CT logs reflect certificates that were issued, not every possible hostname. Historical or internal names may never appear.

crt.sh is a third-party service that occasionally returns HTTP 502. Wait a few minutes and retry, or visit crt.sh directly to confirm their status.

Discover subdomains from Certificate Transparency logs via crt.sh

Passive CT search only — results may be historical.

Try an example:

Discover subdomains from CT logs via crt.sh without DNS brute force. Understand limits and upstream outages.

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