SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for le-na.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- le-na.cz
- Valid from
- Oct 3, 2026
- Valid until
- Jan 1, 2027 (67 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 05374080571E1CA07CF2B9EE7A3720905BB0
- SHA-256 fingerprint
- 21:DA:F0:A8:13:BF:19:44:4B:B8:68:0F:17:CA:F1:B0:B5:6E:AF:A3:89:9A:24:46:F8:2E:C0:C7:42:5C:E7:77
- 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 Oct 5, 2026.
Never get surprised by le-na.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch le-na.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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