SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

postupicka.cz

SSL/TLS Certificate

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SSL/TLS Certificate for postupicka.cz

Valid
Issued by (CA)
Let's Encrypt
Subject
postupicka.cz
Valid from
Jun 23, 2026
Valid until
Sep 21, 2026 (61 days remaining)
Public key
RSA 4096-bit
Serial
0550CF8FE1CC1FFD78F2AE1F34EE2AAEBCF0
SHA-256 fingerprint
40:D0:02:F4:9A:72:CF:D8:C7:73:5C:7D:F5:E8:B3:12:08:B2:71:3A:83:7A:86:7B:D3:4F:BA:6A:30:F0:BA:71
Chain
YR1 → Root YR → ISRG Root X1
Subject Alternative Names (2)
*.postupicka.cz, postupicka.cz

Certificate Authority Authorization (CAA)

No CAA policy is published for this domain — any certificate authority may issue for it.