SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
zena-online.cz
SSL/TLS Certificate
SSL/TLS Certificate for zena-online.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.zena-online.cz
- Valid from
- Aug 8, 2026
- Valid until
- Nov 6, 2026 (85 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06BCF8942AFFC6BEAD55A3C3479264B243CB
- SHA-256 fingerprint
- 32:1D:62:FB:0D:C1:5B:5C:75:5E:1E:73:9E:BC:53:4F:8F:EC:69:62:44:5F:C4:14:27:8C:5D:F7:7F:BE:B0:43
- 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.
Never get surprised by zena-online.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch zena-online.cz continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
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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