SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
kk-net.cz
SSL/TLS Certificate
SSL/TLS Certificate for kk-net.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- zkig.cz
- Valid from
- Sep 12, 2026
- Valid until
- Dec 11, 2026 (74 days remaining)
- Public key
- RSA 3072-bit
- Serial
- 05B2B7987CF094CE3DF9D7C6518346976875
- SHA-256 fingerprint
- C1:D0:37:08:FB:6D:20:63:01:EE:4D:BD:69:B6:D4:43:04:95:F4:0E:21:32:FD:11:7D:EA:70:19:AF:5E:84:12
- Chain
- YR1 → 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 16, 2026.
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Uptime
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DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME 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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