SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
cyf-kr.edu.pl
SSL/TLS Certificate
SSL/TLS Certificate for cyf-kr.edu.pl
Valid- Issued by (CA)
- Hellenic Academic and Research Institutions CA
- Subject
- *.cyf-kr.edu.pl
- Valid from
- Sep 22, 2025
- Valid until
- Sep 22, 2026 (53 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 732CFD4B72269438714BE24B877BB645
- SHA-256 fingerprint
- B8:B4:46:1B:C2:F3:1D:2F:64:24:65:C0:B4:90:19:1C:CC:76:25:64:22:6B:ED:56:76:61:17:49:6B:EF:CB:07
- Chain
- GEANT TLS RSA 1 → HARICA TLS RSA Root CA 2021 → Hellenic Academic and Research Institutions RootCA 2015
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 30, 2026.
Never get surprised by cyf-kr.edu.pl's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch cyf-kr.edu.pl continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.