What powers seijsener.com?
Last seen Sep 2026 · 18 technologies across 10 categories
Analytics
CDN
CMS
Ecommerce
JavaScript frameworks
JavaScript libraries
Miscellaneous
Security
Tag managers
Webmail
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
- 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
- 59% phone
- 41% desktop
Netherlands
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.02 / 10 · ranked #3,526,520 of all domains
18 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.3 s |
| INP | 75 ms |
| CLS | 0.05 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Dutch
- CDN: Cloudflare
- Weight: 9.0 MB · 76 requests
- 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 Cloudflare (104.21.66.12, IPv6)
- DNS: Cloudflare DNS
- Email: no MX record returned, SPF names Microsoft 365
- Email security: SPF (soft fail), DMARC monitor only, DNSSEC signed, CAA
- SSL: Google Trust Services, ECDSA P256, expires Dec 2026
- Common Crawl link graph: rank 15,865,580, 3 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted