What powers 
pyscf.org?
Last seen Aug 2026 · 11 technologies across 9 categories
Analytics
Cloudflare Browser Insights
since Jul 2026
Caching
Varnish
since Feb 2022
CDN
Font scripts
Font Awesome
since Aug 2024
JavaScript frameworks
Miscellaneous
HTTP/3
since Jul 2026
PaaS
GitHub Pages
since Feb 2022
Security
HSTS
since Sep 2022
UI frameworks
Bootstrap
since Aug 2024
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Sep 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
- Sep 2026 * 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 bytespider removed from robots.txt
- Sep 2026 ccbot removed from robots.txt
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 85% desktop
- 15% phone
United States
India
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.84 / 10 · ranked #695,192 of all domains
39 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- CDN: Cloudflare, Fastly
- Weight: 1.1 MB · 23 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on Cloudflare (104.21.94.15, IPv6)
- DNS: Cloudflare DNS
- Email: GoDaddy Email
- Email security: no SPF record, no DMARC record, DNSSEC signed
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Nov 2026
- Common Crawl link graph: rank 648,108, 2 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
Report an incorrect detection
Recent changes
- dropped GoDaddy Aug 2026
- detected Cloudflare Browser Insights Jul 2026
- detected HTTP/3 Jul 2026
- dropped jsDelivr May 2026
- dropped MathJax May 2026