SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
ardat-systems.cz
SSL/TLS Certificate
SSL/TLS Certificate for ardat-systems.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- ardat-systems.cz
- Valid from
- Oct 18, 2026
- Valid until
- Jan 16, 2027 (89 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05FEEA87767D055515B2F5C7BA2F5F80B36B
- SHA-256 fingerprint
- 30:FB:EB:4C:95:F5:ED:21:DB:30:74:EA:FD:32:C0:0E:62:63:79:EC:EC:D3:E6:9C:E2:D6:61:91:4D:C0:52:37
- Chain
- YR2 → Root YR → 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 Sep 7, 2026.
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Uptime
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DNS changes
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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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