SSL/TLS Certificate Lookup

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

ptsr.org.pl

SSL/TLS Certificate

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SSL/TLS Certificate for ptsr.org.pl

Valid
Issued by (CA)
Let's Encrypt
Subject
mail.ptsr.org.pl
Valid from
Jun 10, 2026
Valid until
Sep 8, 2026 (49 days remaining)
Public key
EC 384-bit
Serial
0618983509CA29A7E05A4FC9B00460C405B5
SHA-256 fingerprint
C4:5F:EB:F3:63:21:3F:FD:2B:7B:0E:4D:21:50:6F:DA:B7:C2:51:F4:1C:04:26:7F:85:28:83:2A:82:66:52:29
Chain
YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Subject Alternative Names (3)
mail.ptsr.org.pl, ptsr.org.pl, www.ptsr.org.pl

Certificate Authority Authorization (CAA)

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