What powers isbn.nl?
Last seen Aug 2026 · 27 technologies across 17 categories
Analytics
CDN
CMS
Documentation
Font scripts
JavaScript libraries
Miscellaneous
Operating systems
PaaS
Programming languages
Reverse proxies
Security
Tag managers
UI frameworks
Web frameworks
Web servers
Webmail
AI Crawlers
Restricts 1 of 33 AI crawlers we track by name in its robots.txt. Checked Sep 2026.
Search and AI assistants
- Applebot Restricted
The other 32 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
- Sep 2026 applebot added to robots.txt
AI Crawlers
1 of 33 AI crawlers restricted
Audience
- 55% desktop
- 45% phone
Netherlands
Belgium
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.61 / 10 · ranked #385,213 of all domains
47 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.2 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Dutch (Netherlands)
- Weight: 4.2 MB · 178 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on HOASTED (31.24.250.3)
- DNS: Amazon Route 53
- Email: Microsoft 365
- Email security: no SPF record, no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 2,842,660, 5 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| metadata.isbn.nl | 12 |
| isbn.nl | 10 |
| service.isbn.nl | 10 |
| www.isbn.nl | 10 |