SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
up-down.cz
SSL/TLS Certificate
SSL/TLS Certificate for up-down.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- up-down.cz
- Valid from
- Aug 14, 2026
- Valid until
- Nov 12, 2026 (66 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06B83ED9C0B387B9BBB1886497D715A43732
- SHA-256 fingerprint
- 42:01:83:01:0C:6B:28:75:01:A3:F3:C7:F7:D3:42:1C:0C:4B:E0:39:15:DF:DC:93:08:B8:4A:62:AB:F5:4B:FE
- 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 up-down.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch up-down.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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