SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
gfz-potsdam.de
SSL/TLS Certificate
SSL/TLS Certificate for gfz-potsdam.de
Valid- Issued by (CA)
- Hellenic Academic and Research Institutions CA
- Subject
- www.gfz-potsdam.de
- Valid from
- Jul 23, 2026
- Valid until
- Feb 7, 2027 (197 days remaining)
- Public key
- EC 256-bit
- Serial
- 19B8BE04AEE6F29670AAB3EE619F9FD3
- SHA-256 fingerprint
- 13:70:64:B0:36:49:4D:84:09:AD:8A:62:94:F5:8D:50:5D:32:C7:89:C0:11:E7:59:EA:ED:B5:13:89:64:97:5A
- Chain
- GEANT TLS ECC 1 → HARICA TLS ECC Root CA 2021 → Hellenic Academic and Research Institutions ECC RootCA 2015
Certificate Authority Authorization (CAA)
CAA restricts issuance to harica.gr, pki.dfn.de, sectigo.com; we couldn't map the serving CA (Hellenic Academic and Research Institutions CA) to one of these identifiers.
Never get surprised by gfz-potsdam.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch gfz-potsdam.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.