SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
poly-tech.si
SSL/TLS Certificate
SSL/TLS Certificate for poly-tech.si
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- poly-tech.si
- Valid from
- Sep 28, 2026
- Valid until
- Dec 27, 2026 (47 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 061616A998D8ECB61742B1FFF035DCF70460
- SHA-256 fingerprint
- 8C:05:41:39:4C:59:DC:0A:B1:F0:BC:F9:72:0F:82:8A:EA:4F:10:F2:F1:78:2E:19:13:F4:36:F6:C6:80:97:34
- Chain
- YR1 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
We've observed 1 previous certificate for this host. This certificate has been served since Oct 1, 2026.
Never get surprised by poly-tech.si's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch poly-tech.si continuously, notifying you the moment anything moves across all three signals:
Uptime
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DNS changes
We watch NS, MX, CAA, CNAME, TXT 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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