SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
levna-knihovna.cz
SSL/TLS Certificate
SSL/TLS Certificate for levna-knihovna.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.levna-knihovna.cz
- Valid from
- Oct 29, 2026
- Valid until
- Jan 27, 2027 (81 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 053CC00BD09A19BC59D74A3EEA9E7A403A9A
- SHA-256 fingerprint
- 6E:B3:F2:74:F2:27:68:FA:FC:83:0B:4F:AD:56:B3:F4:97:CC:7A:47:1F:53:F6:99:57:C0:26:C3:FE:83:D7:E2
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
We've observed 1 previous certificate for this host. This certificate has been served since Sep 6, 2026.
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Uptime
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DNS changes
We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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