SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
tespo-ostrava.cz
SSL/TLS Certificate
SSL/TLS Certificate for tespo-ostrava.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- tespo-ostrava.cz
- Valid from
- Jun 20, 2026
- Valid until
- Sep 18, 2026 (55 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05B1F7848C0E1E1BF5B6E2220710E0D2C63A
- SHA-256 fingerprint
- 05:A7:A5:16:16:F4:03:21:78:13:66:AC:E4:57:67:66:78:75:A7:A9:22:77:43:9F:C0:13:8F:83:6B:D2:40:26
- 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.
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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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