SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
simpra.cz
SSL/TLS Certificate
SSL/TLS Certificate for simpra.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- simpra.cz
- Valid from
- Jul 12, 2026
- Valid until
- Oct 10, 2026 (69 days remaining)
- Public key
- EC 256-bit
- Serial
- 053C83F39C58D8001DF9FDA4A36D89F4020A
- SHA-256 fingerprint
- 10:AF:AA:D5:11:D8:42:A9:52:20:5F:BA:96:85:E9:D9:BC:01:91:0B:B2:9E:28:EE:DC:FC:BF:2A:D9:F9:FB:F5
- Chain
- YE1 → Root YE → ISRG Root X2 → 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 Jul 25, 2026.
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This is today's certificate. Turn on monitoring and we'll watch simpra.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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