SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for lerni.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- lerni.cz
- Valid from
- Jun 10, 2026
- Valid until
- Sep 8, 2026 (49 days remaining)
- Public key
- EC 256-bit
- Serial
- 050CE7E701A177B72437E1F42C40F9F2056C
- SHA-256 fingerprint
- 7F:B2:FB:9C:3B:5D:1A:E9:2B:FC:D0:88:EE:04:69:08:7C:C7:CE:AD:2B:69:B4:BB:D1:54:EA:A3:9D:21:38:A8
- Chain
- YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Jul 21, 2026.