What powers 
headfirst.group?
Last seen Sep 2026 · 38 technologies across 24 categories
Advertising
Analytics
Caching
CDN
CMS
Cookie compliance
Databases
Font scripts
Hosting
JavaScript frameworks
JavaScript libraries
Marketing automation
Miscellaneous
Operating systems
Performance
Programming languages
Security
Tag managers
Translation
Video players
Web servers
Webmail
Widgets
WordPress plugins
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 52% desktop
- 48% phone
Netherlands
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.08 / 10 · ranked #517,822 of all domains
76 referring domains · OpenPageRank
Core Web Vitals
| LCP | 4.3 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 3500 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English (United States)
- Weight: 5.8 MB · 126 requests
- WordPress theme: uncode (child: uncode-child) · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- HeadFirst Group
From the homepage's own structured data (Sep 2026).
Infrastructure
- Hosted on Amazon Web Services (18.158.127.106, IPv6)
- DNS: ns0.nl
- Email: Microsoft 365
- Email security: SPF (hard fail), DMARC quarantine, DNSSEC signed
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 7,404,686, 8 hosts
- Verified with: Google, Microsoft 365
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| werkenbij.headfirst.group | 33 |
| headfirst.group | 32 |
Full technology history →
Report an incorrect detection
Recent changes
- dropped Cookiebot Mar 2026
- dropped Facebook Pixel Mar 2026
- dropped Preact Mar 2026
- detected OneTrust Feb 2026