What powers 
robkalmeijer.nl?
Last seen Sep 2026 · 4 technologies across 4 categories
Programming languages
Security
Video players
Web servers
AI Crawlers
Blocks 3 of 33 AI crawlers we track by name in its robots.txt. Checked Sep 2026.
Training crawlers
- CCBot Blocked
- GPTBot Blocked
User-request fetchers
- ChatGPT-User Blocked
The other 30 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 found
- ai.txt not found
AI Crawlers
3 of 33 AI crawlers blocked
Audience
- 51% desktop
- 43% phone
- 6% tablet
Germany
Netherlands
United States
Italy
Belgium
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.87 / 10 · ranked #679,698 of all domains
48 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.8 s |
| INP | 175 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Dutch
- Weight: 6.2 MB · 69 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on KPN KPN National (86.90.148.127)
- DNS: dn-s.nl
- Email: robkalmeijer.nl
- Email security: SPF (hard fail), DMARC reject, DNSSEC signed, CAA, MTA-STS
- SSL: Sectigo, RSA 4096, wildcard, expires Dec 2026
- Common Crawl link graph: rank 893,528, 3 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted