SSL/TLS Certificate Lookup

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

umn.edu.pl

SSL/TLS Certificate

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SSL/TLS Certificate for umn.edu.pl

Expired
Issued by (CA)
Let's Encrypt
Subject
umn.edu.pl
Valid from
Apr 21, 2026
Valid until
Jul 20, 2026 (expired 2 days ago)
Public key
RSA 2048-bit
Serial
0525E92D3AEE43CA9C32A2300FCDDE8FA093
SHA-256 fingerprint
3D:C6:50:32:31:56:80:A4:B7:9A:5A:0F:00:00:30:1E:CA:A0:5E:65:27:23:95:89:72:83:46:C8:37:2E:12:30
Chain
R12 → ISRG Root X1
Subject Alternative Names (2)
umn.edu.pl, www.umn.edu.pl

Certificate Authority Authorization (CAA)

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