SSL/TLS Certificate Lookup

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

comsys.cz

SSL/TLS Certificate

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SSL/TLS Certificate for comsys.cz

Valid
Issued by (CA)
Let's Encrypt
Subject
www.comsys.cz
Valid from
Jun 19, 2026
Valid until
Sep 17, 2026 (57 days remaining)
Public key
EC 256-bit
Serial
05957506450ECBB8CA171F22DA759CADB9D8
SHA-256 fingerprint
B4:7E:75:5B:E1:68:FA:8F:90:BB:6F:BD:38:6F:A9:E4:9E:5C:7C:9F:B2:F4:AE:2C:9C:08:40:43:EE:7D:E1:90
Chain
YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Subject Alternative Names (2)
comsys.cz, www.comsys.cz

Certificate Authority Authorization (CAA)

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