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 b-tel.cz
Hostname mismatch- Issued by (CA)
- Let's Encrypt
- Subject
- netplushosting.cz
- Valid from
- May 19, 2026
- Valid until
- Aug 17, 2026 (25 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 052C1FBA4440265190560684C87E417E2183
- SHA-256 fingerprint
- B6:5B:1B:FA:5F:C6:D6:C0:93:F7:1E:0F:95:0C:92:2E:76:13:F8:16:75:E6:25:9E:73:72:27:A2:14:4B:08:AC
- Chain
- R13 → 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 b-tel.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch b-tel.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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