What powers verhagenleiden.nl?
Last seen Sep 2026 · 18 technologies across 11 categories
Advertising
Microsoft Advertising
since Feb 2021
Analytics
Cloudflare Browser Insights
since Jul 2026
Google Analytics
since Jan 2019
Leadinfo
since Jul 2021
Microsoft Clarity
since Oct 2021
CDN
cdnjs
since Nov 2021
Cloudflare
since May 2022
Cookie compliance
Hosting panels
Plesk
since Apr 2022
JavaScript libraries
Miscellaneous
HTTP/3
since Jul 2026
Programming languages
Security
HSTS
since Jul 2026
Tag managers
Google Tag Manager
since Jan 2019
Webmail
Apple iCloud Mail
since Dec 2024
Microsoft 365
since Aug 2022
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Sep 2026.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
- Sep 2026 bytespider removed from robots.txt
- Sep 2026 amazonbot removed from robots.txt
- Sep 2026 applebot-extended removed from robots.txt
- Sep 2026 meta-externalagent removed from robots.txt
- Sep 2026 ccbot removed from robots.txt
- Sep 2026 claudebot removed from robots.txt
AI Crawlers
No AI crawlers blocked
Audience
- 60% phone
- 40% desktop
Netherlands
Belgium
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.68 / 10 · ranked #2,197,490 of all domains
13 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| INP | 75 ms |
| CLS | 0.15 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Dutch
- CDN: Cloudflare
- Weight: 1.8 MB · 101 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on Cloudflare (104.21.68.135)
- DNS: Cloudflare DNS
- Email: Microsoft 365
- Email security: SPF (soft fail), DMARC monitor only, DNSSEC signed
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Dec 2026
- Common Crawl link graph: rank 12,868,655, 2 hosts
- Verified with: Apple Business, Google, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
Report an incorrect detection
Recent changes
- dropped Nginx Aug 2026
- detected Cloudflare Browser Insights Jul 2026
- detected HSTS Jul 2026
- detected HTTP/3 Jul 2026