What powers teachbooks.io?
Last seen Oct 2026 · 19 technologies across 14 categories
Caching
Varnish
since Apr 2025
CDN
Fastly
since Apr 2025
CMS
Databases
MySQL
since Apr 2025
JavaScript libraries
Miscellaneous
Open Graph
since Apr 2025
RSS
since Apr 2025
PaaS
GitHub Pages
since Apr 2025
Strato
since Apr 2025
Page builders
WordPress Block Editor
since Apr 2025
Performance
Priority Hints
since Apr 2025
Programming languages
PHP
since Apr 2025
Security
HSTS
since Apr 2025
Video players
YouTube
since Apr 2025
WordPress plugins
WordPress themes
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Oct 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 92% desktop
- 8% phone
Netherlands
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.32 / 10 · ranked #2,830,424 of all domains
6 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.8 s |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Oct 2026.
Page
- Language: English (United States)
- CDN: Fastly
- Weight: 2.1 MB · 53 requests
- Structured data: JSON-LD, Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- TeachBooks
From the homepage's own structured data (Oct 2026).
Infrastructure
- Hosted on Fastly (185.199.108.153, IPv6)
- DNS: STRATO
- Email: STRATO
- Email security: no SPF record, DMARC reject
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 2,052,235
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted