crtlog lets you search certificates recorded in public Certificate Transparency logs. Enter a domain, subdomain or wildcard fragment and we’ll show every certificate that includes it.
Free usage limits
- 10 searches per day per IP address.
- 1 search every 10 seconds — please slow down if you see a wait message.
- Results are capped at 1,000 certificates per request; use the pagination buttons to browse more.
- API requests must come from a real web browser. Scripts using curl, wget or python-requests need an account (coming soon).
- You can see certificate metadata, but we never expose the raw certificate file (DER) to anonymous users.
Need more? A free account with a verified email will raise the limit to 200 searches per day and allow scripted access.
| SANs | Parent domain | Issuer | Not before | Not after | SHA-256 |
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