SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
o-tentic.cz
SSL/TLS Certificate
SSL/TLS Certificate for o-tentic.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- o-tentic.cz
- Valid from
- Oct 3, 2026
- Valid until
- Jan 1, 2027 (57 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 050FA3F1ED0781AD02344574976D15ADA519
- SHA-256 fingerprint
- 94:1E:C3:08:A8:E4:99:BD:3A:79:FC:A3:BC:7E:C3:0E:98:BA:3E:C1:57:72:5C:1D:F5:0D:16:9D:9D:65:24:41
- 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.
We've observed 1 previous certificate for this host. This certificate has been served since Nov 1, 2026.
Never get surprised by o-tentic.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch o-tentic.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, 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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