SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
zt-blansko.cz
SSL/TLS Certificate
SSL/TLS Certificate for zt-blansko.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- ztenergy.cz
- Valid from
- Jul 9, 2026
- Valid until
- Oct 7, 2026 (50 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0553CA2559306A3CD70007A48338753D4EDB
- SHA-256 fingerprint
- 79:E1:CE:DD:07:46:20:AA:5A:6C:DE:40:C3:7F:92:FC:AC:59:FA:8B:36:BD:67:1B:1F:39:43:17:8E:12:EF:93
- 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.
Never get surprised by zt-blansko.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch zt-blansko.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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