What powers opensfhistory.org?
Last seen Aug 2026 · 16 technologies across 10 categories
Analytics
CDN
JavaScript frameworks
JavaScript libraries
Maps
PaaS
Payment processors
UI frameworks
Web servers
Widgets
AI Crawlers
Blocks 8 of 33 AI crawlers we track by name in its robots.txt. Checked Sep 2026.
Training crawlers
- Applebot-Extended Blocked
- Bytespider Blocked
- CCBot Blocked
- ClaudeBot Blocked
- Google-Extended Blocked
- GPTBot Blocked
- meta-externalagent Blocked
Search and AI assistants
- Amazonbot Blocked
The other 25 AI crawlers we track are not mentioned and stay allowed by default.
- robots.txt found
- llms.txt not found
- ai.txt not found
Content Signals:
search=yes ai-train=no declared in robots.txt
- Aug 2026 bytespider added to robots.txt
- Aug 2026 * added to robots.txt
- Aug 2026 amazonbot added to robots.txt
- Aug 2026 applebot-extended added to robots.txt
- Aug 2026 meta-externalagent added to robots.txt
- Aug 2026 ccbot added to robots.txt
AI Crawlers
8 of 33 AI crawlers blocked
Standards: Content Signals
Audience
- 67% desktop
- 33% phone
United States
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.10 / 10 · ranked #504,979 of all domains
72 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- CDN: Cloudflare
- Weight: 2.6 MB · 54 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on Cloudflare (104.21.20.123, IPv6)
- DNS: Cloudflare DNS
- Email: SiteGround Email
- Email security: SPF (soft fail), DMARC monitor only
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Dec 2026
- Common Crawl link graph: rank 78,422, 3 hosts
DNS records as swept Aug 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| opensfhistory.org | 16 |
| www.opensfhistory.org | 16 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Cloudflare Aug 2026
- detected Umami Jun 2026