SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
uni-duisburg-essen.de
SSL/TLS Certificate
SSL/TLS Certificate for uni-duisburg-essen.de
Valid- Issued by (CA)
- Hellenic Academic and Research Institutions CA
- Subject
- uni-due.de
- Valid from
- Nov 14, 2025
- Valid until
- Nov 14, 2026 (96 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0369C7A084C05C9A34DD0035756FD1AE
- SHA-256 fingerprint
- 33:F7:B3:94:E9:83:F4:6F:81:16:B4:CD:4C:2A:AA:65:B0:E9:A9:A6:48:8E:CA:1F:70:E1:BE:C9:9E:B6:93:33
- 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.
Never get surprised by uni-duisburg-essen.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch uni-duisburg-essen.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.