What powers 
concerto.nl?
Last seen Aug 2026 · 28 technologies across 15 categories
Caching
CDN
CMS
Databases
Ecommerce
Font scripts
JavaScript libraries
Miscellaneous
Performance
Programming languages
Security
UI frameworks
Web servers
Webmail
WordPress plugins
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
- 71% phone
- 29% desktop
Netherlands
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.93 / 10 · ranked #627,433 of all domains
41 referring domains · OpenPageRank
Core Web Vitals
| LCP | 4.3 s |
| INP | 150 ms |
| CLS | 0 |
| TTFB | 3400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United States)
- Weight: 38.6 MB · 433 requests
- WordPress theme: thegem-elementor · all themes
- Structured data: JSON-LD, 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 AS-EUROFIBER (161.51.82.65)
- DNS: TransIP
- Email: Microsoft 365
- Email security: SPF (soft fail), DMARC monitor only, DNSSEC signed
- SSL: Let's Encrypt, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 3,182,221, 2 hosts
- Verified with: Google, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
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Recent changes
- dropped Lightbox Aug 2026
- detected Lightbox May 2026
- detected Open Graph Mar 2026
- detected Yoast SEO Mar 2026
- dropped The Events Calendar Dec 2025
- detected Twitter Emoji (Twemoji) Dec 2025
- dropped Lightbox Nov 2025