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 s-b.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- s-b.cz
- Valid from
- Aug 7, 2026
- Valid until
- Nov 5, 2026 (80 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06695F4E410835814B199F678BA2A60508C0
- SHA-256 fingerprint
- 08:77:BA:35:D8:C5:6E:A0:FF:44:68:EF:51:B6:6D:E6:41:5B:E4:3E:AC:01:1E:18:0B:34:8D:0B:1E:53:D8:D0
- 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 s-b.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch s-b.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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