What technology does gfz.de use?

gfz.de is built with PHP, Apache.

Is gfz.de secure (HTTPS)?

Yes. gfz.de uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Feb 7, 2027.

Hosting provider information for gfz.de is not available yet.

What is gfz.de's SEO score?

gfz.de scored 85/100 for SEO in the latest analysis (great).

What is gfz.de's overall website score?

gfz.de has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.

gfz.de

Startseite: GFZ

Last scanned Jul 26, 2026, 5:47 AM

Overall score

Great

Summary

Das GFZ Helmholtz-Zentrum für Geoforschung ist das nationale Zentrum für die Erforschung der festen Erde. This website uses Apache. SEO is good (85/100) and accessibility is excellent (100/100). Security scores fair (70/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.

Das GFZ Helmholtz-Zentrum für Geoforschung ist das nationale Zentrum für die Erforschung der festen Erde. Wir untersuchen die Geosphäre im hochkomplexen System Erde mit den weiteren Teilsystemen und ihren ineinandergreifenden Kreisläufen und weitverzweigten Ursache-Wirkungs-Ketten.

Top issues to fix

6 issues found · 2 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
1 cookie without Secure/HttpOnly flags
Security
Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Meta description longer than 160 characters
SEO
Trim the meta description to under 160 characters to avoid truncation in search results.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

SEO

2 issue(s) found

Performance

619 ms

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

Facebook Instagram YouTube

Contact

Email, phone, and address published on this site's own pages.

Email: info@example.com

Meta tags

Title: Startseite: GFZ
Description: Das GFZ Helmholtz-Zentrum für Geoforschung ist das nationale Zentrum für die Erforschung der festen Erde. Wir untersuchen die Geosphäre im hochkomplexen System Erde mit den weiteren Teilsystemen und ihren ineinandergreifenden Kreisläufen und weitverzweigten Ursache-Wirkungs-Ketten.
Canonical: https://www.gfz.de/
Language: de
Charset: utf-8
Viewport: width=device-width, initial-scale=1
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

PHP Apache

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: 139.17.229.15
ASN: —

DNS records

Type	Value
A	139.17.229.15
AAAA	—
MX	b1791.mx.srv.dfn.de c1791.mx.srv.dfn.de a1791.mx.srv.dfn.de
TXT	—
NS	zrt7b.gfz-potsdam.de deneb.dfn.de
CAA	0 issue "sectigo.com" 0 issue "pki.dfn.de" 0 issue "harica.gr"
CNAME	gfz.de
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Hellenic Academic and Research Institutions CA
Subject: www.gfz-potsdam.de
Valid from: Jul 23, 2026
Valid to: Feb 7, 2027
Days until expiry: 195
SAN domains: www.gfz-potsdam.de, gfz.de, www-prod4.gfz.de, www-prod3.gfz-potsdam.de, www-prod2.gfz-potsdam.de, gfz-potsdam.de, www-prod6.gfz.de, www.gfz.de, www-prod1.gfz-potsdam.de, www-prod5.gfz.de

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsEnabled
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 1 · H2 5 · H3 24

Links

82 internal · 18 external · 0 broken

Images

39 total · 0 missing alt

Scripts / Styles

2 scripts · 3 stylesheets

JS / CSS size

279 KB · 305 KB

Page size

104 KB

Robots.txt & Sitemap

robots.txt: Found
Disallow rules: 6
sitemap.xml: Found
URLs in sitemap: -1

SEO issues

Meta description longer than 160 characters
No structured data (JSON-LD) found

Scan details

Requested URL: https://gfz.de
Final URL: https://www.gfz.de/
HTTP status: 200
HTTP version: HTTP/2
Response time: 617 ms
HTML size: 104 KB
Redirect chain: https://gfz.de → https://www.gfz.de/

See something wrong on this report? Request a correction

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