SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for gfz.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 (196 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.de's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch gfz.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.