SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
cel-tec.cz
SSL/TLS Certificate
SSL/TLS Certificate for cel-tec.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- cel-tec.cz
- Valid from
- Sep 19, 2026
- Valid until
- Dec 18, 2026 (64 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 060EBCEC88EC80DFD4D442CB61351D48EF66
- SHA-256 fingerprint
- BB:79:80:66:0C:4D:B3:4F:1A:5A:33:E8:C0:05:E2:CC:61:96:0E:E4:65:4A:51:5C:61:C2:E2:7B:E8:11:97:5E
- 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.
This certificate has been served since Oct 12, 2026.
Never get surprised by cel-tec.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch cel-tec.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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