zlb.de
Startseite Zentral- und Landesbibliothek Berlin | ZLB
Last scanned Aug 24, 2026, 1:22 PM · 1 view
Overall score
Excellent
Summary
Die Zentral- und Landesbibliothek Berlin verfügt über 3,5 Millionen Medien, bietet Beratung, Lernangebote, Veranstaltungen und vieles mehr. This website uses Apache. SEO is excellent (90/100) and accessibility is excellent (100/100). Security scores excellent (100/100) and performance excellent (90/100). Top issue: robots.txt not found.
Die Zentral- und Landesbibliothek Berlin verfügt über 3,5 Millionen Medien, bietet Beratung, Lernangebote, Veranstaltungen und vieles mehr.
Top issues to fix
4 issues found
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
12 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
2 issue(s) found
Performance
698 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
- info@zlb.de
- Phone
- +493090226-401
Meta tags
- Title
- Startseite Zentral- und Landesbibliothek Berlin | ZLB
- Description
- Die Zentral- und Landesbibliothek Berlin verfügt über 3,5 Millionen Medien, bietet Beratung, Lernangebote, Veranstaltungen und vieles mehr.
- Canonical
- https://www.zlb.de/
- Language
- de-de
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://www.zlb.de/typo3conf/ext/wwt3_sitepackage_base/Resources/Public/frontend/favicons/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- —
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- www.zlb.de
- Valid from
- Jul 7, 2026
- Valid to
- Oct 5, 2026
- Days until expiry
- 41
- SAN domains
- www.zlb.de, zlb.de
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 12 · H3 72
Links
104 internal · 36 external · 12 broken
Images
65 total · 0 missing alt
Scripts / Styles
20 scripts · 2 stylesheets
JS / CSS size
868 B · 2.0 KB
Page size
372 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://zlb.de
- Final URL
- https://www.zlb.de/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 691 ms
- HTML size
- 372 KB
- Redirect chain
- https://zlb.de → https://www.zlb.de/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does zlb.de use?
- zlb.de is built with jQuery, Apache.
- Is zlb.de secure (HTTPS)?
- Yes. zlb.de uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 5, 2026.
- Who hosts zlb.de?
- Hosting provider information for zlb.de is not available yet.
- What is zlb.de's SEO score?
- zlb.de scored 90/100 for SEO in the latest analysis (excellent).
- What is zlb.de's overall website score?
- zlb.de has an overall SiteGraph score of 95/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card