What powers 
fast.io?
Last seen Sep 2026 · 34 technologies across 17 categories
Analytics
CDN
CMS
Cookie compliance
JavaScript frameworks
JavaScript libraries
Live chat
Miscellaneous
PaaS
Payment processors
Performance
Security
Static site generator
Tag managers
UI frameworks
Webmail
Widgets
AI Crawlers
Does not block any of the 33 AI crawlers we track in its robots.txt. Checked Oct 2026.
Training crawlers
- Bytespider Allowed
- CCBot Allowed
- ClaudeBot Allowed
- Google-Extended Allowed
- GPTBot Allowed
Search and AI assistants
- PerplexityBot Allowed
The other 27 AI crawlers we track are not mentioned and stay allowed by default.
- robots.txt found
- llms.txt found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 51% desktop
- 47% phone
- 2% tablet
United States
India
United Kingdom
Italy
Germany
Canada
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.69 / 10 · ranked #323,418 of all domains
66 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.4 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English
- CDN: Cloudflare
- Weight: 0.5 MB · 66 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 (104.18.38.238, IPv6)
- DNS: Cloudflare DNS
- Email: Google Workspace
- Email security: no SPF record, no DMARC record, DNSSEC signed, CAA
- SSL: Google Trust Services, ECDSA P256, expires Nov 2026
- Common Crawl link graph: rank 64,754, 13 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| about.fast.io | 14 |
| fast.io | 14 |
| www.fast.io | 14 |
| status.fast.io | 13 |
| go.fast.io | 12 |
Full technology history →
Report an incorrect detection
Recent changes
- detected React Router Sep 2026
- detected PostHog Jul 2026
- dropped cdnjs Apr 2026
- dropped Unpkg Apr 2026
- detected CookieYes Feb 2026
- dropped Google Font API Feb 2026
- detected Astro Jan 2026
- dropped CookieYes Jan 2026
- dropped core-js Jan 2026
- detected Tailwind CSS Jan 2026
- dropped cdnjs Dec 2025
- dropped PDF.js Dec 2025
- dropped PWA Dec 2025
- dropped Unpkg Dec 2025