What powers npiviewer.com?
Last seen Jun 2026 · 19 technologies across 13 categories
Analytics
Cloudflare Browser Insights
since Feb 2026
Google Analytics
since Jul 2023
Caching
RackCache
since Jul 2023
CDN
Cloudflare
since Feb 2026
JavaScript libraries
Miscellaneous
HTTP/3
since Feb 2026
PaaS
Amazon Web Services
since Jul 2023
Programming languages
Ruby
since Jul 2023
RUM
New Relic
since Jul 2023
Security
Cloudflare Turnstile
since May 2026
HSTS
since Jul 2023
UI frameworks
Web frameworks
Ruby on Rails
since Jul 2023
Web servers
Webmail
Microsoft 365
since Jul 2023
Audience
- 80% desktop
- 20% phone
United States
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
0.47 / 10 · ranked #26,118,725 of all domains
2 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.1 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 2100 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- CDN: Cloudflare
- Weight: 0.5 MB · 14 requests
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| www.npiviewer.com | 16 |
| beta.npiviewer.com | 15 |
| web01.npiviewer.com | 15 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Cloudflare Turnstile May 2026
- detected Cloudflare Feb 2026
- detected Cloudflare Browser Insights Feb 2026
- detected HTTP/3 Feb 2026