SSL/TLS Certificate Lookup

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

regdec.cz

SSL/TLS Certificate

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SSL/TLS Certificate for regdec.cz

Valid
Issued by (CA)
Let's Encrypt
Subject
regdec.cz
Valid from
Jun 1, 2026
Valid until
Aug 30, 2026 (40 days remaining)
Public key
RSA 2048-bit
Serial
054D37325044B140846D160AEBE1C20D729F
SHA-256 fingerprint
BF:3F:F9:F8:5B:6A:FC:4D:77:A8:74:3C:55:C6:F0:94:DE:20:DA:69:57:2F:40:D4:6A:79:2A:A9:B7:AA:64:7A
Chain
YR2 → Root YR → ISRG Root X1
Subject Alternative Names (2)
regdec.cz, www.regdec.cz

Certificate Authority Authorization (CAA)

The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).