SSL/TLS Certificate Lookup

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

wsei.edu.pl

SSL/TLS Certificate

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SSL/TLS Certificate for wsei.edu.pl

Valid
Issued by (CA)
Let's Encrypt
Subject
wsei.edu.pl
Valid from
Jul 17, 2026
Valid until
Oct 15, 2026 (85 days remaining)
Public key
EC 256-bit
Serial
05680105A6B86E970F8F877BEBD73B6B2094
SHA-256 fingerprint
9E:D1:6D:F3:1C:8F:62:0C:9A:3D:CE:4C:C7:4D:E0:CE:DA:26:35:61:A4:5F:95:73:06:2C:C9:7B:30:4A:D7:89
Chain
YE1 → Root YE → ISRG Root X2 → ISRG Root X1
Subject Alternative Names (2)
*.wsei.edu.pl, wsei.edu.pl

Certificate Authority Authorization (CAA)

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