SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
hs-duesseldorf.de
SSL/TLS Certificate
SSL/TLS Certificate for hs-duesseldorf.de
Valid- Issued by (CA)
- Hellenic Academic and Research Institutions CA
- Subject
- *.hs-duesseldorf.de
- Valid from
- Feb 18, 2026
- Valid until
- Feb 18, 2027 (138 days remaining)
- Public key
- RSA 4096-bit
- Serial
- 07F69F2E12A8D4B09F800AA4F786C6E9
- SHA-256 fingerprint
- 65:63:05:90:97:4B:54:43:82:8C:63:A0:0F:38:C0:20:86:7A:15:0A:E3:DA:BD:DF:E9:AA:54:77:4D:9B:D1:D1
- 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 Aug 7, 2026.
Never get surprised by hs-duesseldorf.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch hs-duesseldorf.de 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.