SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for fsi.pl
Valid- Issued by (CA)
- Asseco Data Systems S.A.
- Subject
- *.fsi.pl
- Valid from
- Dec 11, 2025
- Valid until
- Dec 11, 2026 (130 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 6F58C121E9093841912C6F8D3FE8C55F
- SHA-256 fingerprint
- C0:6B:A4:D6:0D:5D:9B:D7:16:D1:52:D9:3D:0E:65:BB:BE:BE:04:28:27:79:B7:8C:53:F9:A0:23:B5:CE:27:EB
- Chain
- Certum DV TLS G2 R39 CA → Certum Trusted Root CA → Certum Trusted Network CA
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Jul 29, 2026.
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This is today's certificate. Turn on monitoring and we'll watch fsi.pl continuously, notifying you the moment anything moves across all three signals:
Uptime
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DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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