SSL/TLS Certificate Lookup

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

defgo.com

SSL/TLS Certificate

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SSL/TLS Certificate for defgo.com

Valid
Issued by (CA)
Asseco Data Systems S.A.
Subject
*.defgo.com
Valid from
Feb 19, 2026
Valid until
Feb 19, 2027 (213 days remaining)
Public key
RSA 2048-bit
Serial
11B3C00247A2B92D68360397A8854503
SHA-256 fingerprint
51:2B:47:28:0A:35:90:BE:B0:86:B8:2C:B7:9C:99:D3:AD:2C:AE:A9:77:1A:CC:7D:FC:34:E5:2B:81:51:B1:B5
Chain
Certum OV TLS G2 R39 CA → Certum Trusted Root CA → Certum Trusted Network CA
Subject Alternative Names (2)
*.defgo.com, defgo.com

Certificate Authority Authorization (CAA)

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