What powers sirjohnleman.co.uk?
Last seen Sep 2026 · 16 technologies across 10 categories
Analytics
CDN
Comment systems
Font scripts
Hosting panels
JavaScript graphics
JavaScript libraries
Maps
Miscellaneous
Webmail
AI Crawlers
Restricts 8 of 33 AI crawlers we track by name in its robots.txt. Checked Oct 2026.
Training crawlers
- Applebot-Extended Restricted
- Bytespider Restricted
- CCBot Restricted
- ClaudeBot Restricted
- Google-Extended Restricted
- GPTBot Restricted
- img2dataset Restricted
- meta-externalagent Restricted
The other 25 AI crawlers we track are not mentioned and only inherit the catch-all rules that apply to every crawler.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
- Sep 2026 ccbot added to robots.txt
- Sep 2026 claudebot added to robots.txt
- Sep 2026 meta-externalagent added to robots.txt
- Sep 2026 gptbot added to robots.txt
- Sep 2026 bytespider added to robots.txt
- Sep 2026 img2dataset added to robots.txt
AI Crawlers
8 of 33 AI crawlers restricted
Audience
- 85% phone
- 15% desktop
United Kingdom
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.56 / 10 · ranked #5,983,969 of all domains
9 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.3 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English
- Weight: 11.7 MB · 93 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Sir John Leman High School
- Founded: 1631
- Country: United Kingdom
From Wikidata (CC0).
Infrastructure
- Hosted on FIBERSTATE (78.154.108.94)
- DNS: livedns.co.uk
- Email: Microsoft 365
- Email security: SPF (hard fail), no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 7,895,191
- Verified with: Apple Business, Google, Microsoft 365
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Full technology history →
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Recent changes
- dropped Cloudflare Bot Management Aug 2026
- dropped Vimeo Jun 2026
- dropped IIS May 2026
- dropped PHP May 2026
- dropped Windows Server May 2026
- detected PHP Mar 2026