What powers 
school21.org.uk?
Last seen Sep 2026 · 39 technologies across 19 categories
Analytics
CDN
CMS
Databases
Font scripts
Issue trackers
JavaScript frameworks
JavaScript graphics
JavaScript libraries
Miscellaneous
PaaS
Page builders
Performance
Programming languages
Security
UI frameworks
Webmail
WordPress plugins
WordPress themes
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 66% phone
- 34% desktop
United Kingdom
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.59 / 10 · ranked #818,803 of all domains
53 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United States)
- CDN: Cloudflare
- Weight: 1.8 MB · 98 requests
- WordPress theme: hello-elementor · all themes
- Structured data: JSON-LD, Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
From the homepage's own structured data (Sep 2026).
Infrastructure
- Hosted on Cloudflare (104.21.34.5, IPv6)
- DNS: Cloudflare DNS
- Email: Microsoft 365
- Email security: SPF (hard fail), DMARC quarantine
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Dec 2026
- Common Crawl link graph: rank 7,025,027, 2 hosts
- Verified with: Apple Business, Google, Have I Been Pwned, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.school21.org.uk | 34 |
| school21.org.uk | 28 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Microsoft 365 Aug 2026
- dropped Underscore.js May 2026
- dropped WPForms May 2026
- detected Twitter Emoji (Twemoji) Dec 2025
- detected Cloudflare Browser Insights Nov 2025