SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
aptech.cz
SSL/TLS Certificate
SSL/TLS Certificate for aptech.cz
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- foto-trinec.cz
- Valid from
- May 25, 2026
- Valid until
- Aug 23, 2026 (31 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 06CC5368E71CEEBC31C716C9DFC4A84F7FDF
- SHA-256 fingerprint
- AD:92:BC:5F:B2:2D:5C:46:59:18:FD:7E:F3:84:20:30:7F:17:0E:E2:44:7B:E8:9D:DA:60:07:66:CD:94:76:57
- Chain
- R12 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
This certificate has been served since Jul 22, 2026.
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DNS changes
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TLS certificate
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