SSL/TLS Certificate Lookup

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

upominki.com.pl

SSL/TLS Certificate

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SSL/TLS Certificate for upominki.com.pl

Valid
Issued by (CA)
Asseco Data Systems S.A.
Subject
upominki.com.pl
Valid from
Jan 30, 2026
Valid until
Jan 30, 2027 (193 days remaining)
Public key
RSA 2048-bit
Serial
0848DC4AD20A2CD3871A12B9B342A038
SHA-256 fingerprint
71:DE:9E:D9:D0:B6:2E:1C:A9:9D:F5:3E:C9:83:49:92:F1:AC:20:68:74:56:E1:68:F2:E5:DA:55:7D:2B:C2:B5
Chain
Certum DV TLS G2 R39 CA → Certum Trusted Root CA
Subject Alternative Names (2)
upominki.com.pl, www.upominki.com.pl

Certificate Authority Authorization (CAA)

CAA restricts issuance to certum.pl, letsencrypt.org; we couldn't map the serving CA (Asseco Data Systems S.A.) to one of these identifiers.