SSL/TLS Certificate Lookup

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

ratuj.org

SSL/TLS Certificate

WhoisRDAPDNS RecordsCertificateUptimeDiagnosticsHistoryHide Contact Info

SSL/TLS Certificate for ratuj.org

Hostname mismatch
Issued by (CA)
nazwa.pl Sp. z o.o.
Subject
*.nazwa.pl
Valid from
Jan 9, 2026
Valid until
Jan 8, 2027 (171 days remaining)
Public key
RSA 2048-bit
Serial
7BF4D5BA15ED2A155029D7CAFB6E8496
SHA-256 fingerprint
BE:1A:39:9D:DC:8B:97:07:F7:C8:A9:FA:5B:A7:64:B2:62:8C:2C:D7:77:26:B2:CE:91:80:36:24:5D:B2:EA:74
Chain
nazwaSSL DV TLS G2 R29 CA → Certum Trusted Root CA
Subject Alternative Names (2)
*.nazwa.pl, nazwa.pl

Certificate Authority Authorization (CAA)

CAA restricts issuance to certum.pl, letsencrypt.org; we couldn't map the serving CA (nazwa.pl Sp. z o.o.) to one of these identifiers.