What powers 
schulbuchzentrum-online.de?
Last seen Nov 2023 · 14 technologies across 9 categories
Analytics
Google Analytics
since Jun 2018
Google Analytics Enhanced eCommerce
since Jun 2018
Matomo Analytics
since Jan 2016
JavaScript Frameworks
JavaScript Libraries
Programming languages
PHP
since Aug 2022
Security
HSTS
since Sep 2022
Tag Managers
Google Tag Manager
since Mar 2018
UI frameworks
Web Servers
Apache HTTP Server
since Jan 2016
Nginx
since Sep 2018
Webmail
Microsoft 365
since Apr 2023
AI Crawlers
Blocks all crawlers by default in robots.txt (User-agent: *). Checked Oct 2026.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
AI Crawlers
All crawlers blocked
Audience
Germany
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.54 / 10 · ranked #851,488 of all domains
42 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Infrastructure
- Hosted on GDS-1 (217.13.73.44)
- DNS: hosting.de
- Email: Microsoft 365
- Email security: SPF (hard fail), no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 789,721, 5 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.schulbuchzentrum-online.de | 10 |
| secure.schulbuchzentrum-online.de | 6 |