SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
k-buildingcb.cz
SSL/TLS Certificate
SSL/TLS Certificate for k-buildingcb.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- k-buildingcb.cz
- Valid from
- Aug 31, 2026
- Valid until
- Nov 29, 2026 (27 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06FA39107888D7700CF60D8D89B4FF63FAF2
- SHA-256 fingerprint
- 51:07:4E:ED:E4:1B:0F:74:24:7A:0A:BD:F0:50:22:D2:C0:B2:80:7B:76:2F:E5:D8:FE:C7:61:F2:1C:6C:0A:49
- Chain
- YR2 → Root YR → 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 Sep 5, 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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