What powers 
crsi.org?
Last seen Sep 2026 · 51 technologies across 24 categories
Analytics
CDN
CMS
Databases
Ecommerce
Font scripts
JavaScript frameworks
JavaScript graphics
JavaScript libraries
LMS
Miscellaneous
PaaS
Performance
Programming languages
RUM
Security
SEO
UI frameworks
Video players
Web frameworks
Web servers
WordPress plugins
WordPress themes
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Oct 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
- Oct 2026 * removed from robots.txt
- Oct 2026 robots.txt removed
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 72% desktop
- 28% phone
United States
Philippines
India
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.54 / 10 · ranked #395,582 of all domains
99 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.1 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 1500 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English (United States)
- CDN: Cloudflare
- Weight: 5.7 MB · 148 requests
- WordPress theme: astra (child: ae-child-theme) · all themes
- Structured data: JSON-LD, Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Concrete Reinforcing Steel Institute
- Founded: 1924
- Country: United States
- Profiles: Facebook, X, LinkedIn, Instagram
From the homepage's own structured data (Oct 2026) and Wikidata (CC0).
Infrastructure
- Registered Feb 1996 (30 years) via Tucows Domains Inc., renews Feb 2027
- Hosted on Cloudflare (141.193.213.20)
- DNS: Azure DNS
- Email: Proofpoint Essentials
- Email security: no SPF record, no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 1,081,046, 9 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.crsi.org | 28 |
| members.crsi.org | 27 |
| resources.crsi.org | 16 |
| learning.crsi.org | 15 |
Full technology history →
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Recent changes
- dropped GSAP Sep 2026
- dropped Isotope Sep 2026
- detected Azure Edge Network Jan 2026