nbn-resolving.de
URN:NBN Resolver for Germany and Switzerland
Last scanned Jul 26, 2026, 3:19 PM
Overall score
Fair
Summary
This website uses Apache hosted on DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE. SEO is fair (50/100) and accessibility is fair (65/100). Security scores fair (65/100) and performance fair (70/100). Top issue: Missing meta description.
- Germany
- Hosted on DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE
Top issues to fix
16 issues found · 5 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Slow estimated load (5.9s)
PerformanceUse a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
+10 more issues — details in the sections below.
SEO
7 issue(s) found
Performance
5.92 s
Security
HTTPS & header checks
Accessibility
3 issue(s) found
Contact
Email, phone, and address published on this site's own pages.
- urn-support@dnb.de
Meta tags
- Title
- URN:NBN Resolver for Germany and Switzerland
- Description
- Canonical
- Language
- Charset
- Viewport
- width=device-width, initial-scale=1.0, maximum-scale=1.5, user-scalable=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- CDN provider
- —
- IP address
- 193.175.100.226
- ASN
- AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT |
|
| NS |
|
| CAA |
|
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Hellenic Academic and Research Institutions CA
- Subject
- nbn-resolving.org
- Valid from
- Nov 12, 2025
- Valid to
- Nov 12, 2026
- Days until expiry
- 108
- SAN domains
- nbn-resolving.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 2 cookie(s) observed
Content & assets
Headings
H1 0 · H2 3 · H3 4
Links
3 internal · 6 external · 2 broken
Images
5 total · 2 missing alt
Scripts / Styles
1 scripts · 10 stylesheets
JS / CSS size
0 B · 359 KB
Page size
11.6 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing meta description
- Missing canonical link
- No H1 heading found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- More than 20% of images are missing alt text
- No H1 heading found
- Missing <html lang> attribute
Scan details
- Requested URL
- https://nbn-resolving.de
- Final URL
- https://nbn-resolving.org/gui/urn
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 5.92 s
- HTML size
- 11.6 KB
- Redirect chain
- https://nbn-resolving.de → https://nbn-resolving.org/ → http://nbn-resolving.org/gui/urn → https://nbn-resolving.org/gui/urn
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does nbn-resolving.de use?
- nbn-resolving.de is built with Apache.
- Is nbn-resolving.de secure (HTTPS)?
- Yes. nbn-resolving.de uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Nov 12, 2026.
- Who hosts nbn-resolving.de?
- nbn-resolving.de is hosted on DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE.
- What is nbn-resolving.de's SEO score?
- nbn-resolving.de scored 50/100 for SEO in the latest analysis (fair).
- What is nbn-resolving.de's overall website score?
- nbn-resolving.de has an overall SiteGraph score of 62/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card