What powers 
opticaopen.org?
Last seen Jan 2026 · 10 technologies across 8 categories
Advertising
Microsoft Advertising
since Jan 2026
Analytics
Google Analytics
since Mar 2023
Font scripts
Font Awesome
since Dec 2023
JavaScript frameworks
JavaScript libraries
Operating systems
Windows Server
since Oct 2023
Tag managers
Google Tag Manager
since Jun 2023
Web servers
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
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 70% desktop
- 31% phone
United States
India
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.47 / 10 · ranked #922,278 of all domains
33 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2 s |
| INP | 75 ms |
| CLS | 0.4 |
| TTFB | 1400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Infrastructure
- Hosted on UUNET (65.202.222.109)
- DNS: osa.org
- Email: no MX record returned
- SSL: DigiCert, RSA 2048, expires Jan 2027
- Common Crawl link graph: rank 2,469,745, 3 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| opticaopen.org | 10 |
| preprints.opticaopen.org | 2 |