What powers cs161.org?
Last seen Apr 2026 · 27 technologies across 15 categories
Caching
Varnish
since Mar 2020
CDN
IaaS
Google Cloud
since Dec 2024
JavaScript frameworks
JavaScript graphics
JavaScript libraries
Miscellaneous
PaaS
GitHub Pages
since Mar 2020
Performance
Google Cloud Trace
since Dec 2024
Programming languages
Security
HSTS
since Feb 2023
Static site generator
UI frameworks
Web frameworks
Ruby on Rails
since Mar 2020
Web servers
Audience
- 100% desktop
United States
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
0.50 / 10 · ranked #24,290,596 of all domains
26 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.5 s |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Jun 2026.
Subdomains
| Host | Techs |
|---|---|
| oh.cs161.org | 15 |
| fa23.cs161.org | 10 |
| sp24.cs161.org | 9 |
| su23.cs161.org | 9 |
| textbook.cs161.org | 9 |
| fa24.cs161.org | 8 |
| sp22.cs161.org | 7 |
| sp25.cs161.org | 7 |
| su20.cs161.org | 7 |
| su22.cs161.org | 7 |
| cs161.org | 6 |
| fa22.cs161.org | 6 |
| sp23.cs161.org | 6 |