What powers sieboldhuis.org?
Last seen Jun 2026 · 26 technologies across 17 categories
Advertising
AppNexus
since Sep 2021
Analytics
CDN
Cloudflare
since Apr 2023
Google Cloud CDN
since Apr 2023
CMS
Craft CMS
since Jan 2019
IaaS
Google Cloud
since Apr 2023
JavaScript libraries
Miscellaneous
Performance
Blitz
since May 2022
Photo galleries
PhotoSwipe
since Sep 2022
Programming languages
PHP
since Jan 2019
Security
Cloudflare Bot Management
since Sep 2025
HSTS
since Sep 2022
SEO
SEOmatic
since May 2022
Tag managers
Google Tag Manager
since Jan 2019
UI frameworks
Web frameworks
Yii
since Jan 2019
Web servers
Nginx
since Aug 2021
Webmail
Microsoft 365
since Aug 2022
Audience
- 73% phone
- 23% desktop
- 4% tablet
Netherlands
Japan
Belgium
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
4.69 / 10 · ranked #352,349 of all domains
124 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.1 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Dutch
- Weight: 1.7 MB · 74 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| tickets.sieboldhuis.org | 17 |
| www.sieboldhuis.org | 15 |
Full technology history →
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Recent changes
- detected Cloudflare Bot Management Sep 2025