What powers orsj.org?
Last seen Oct 2026 · 19 technologies across 13 categories
Analytics
Google Analytics
since May 2022
Caching
CMS
Databases
MySQL
since Dec 2021
Sendgrid
since Aug 2022
Font scripts
Google Font API
since Dec 2021
Twitter Emoji (Twemoji)
since Dec 2021
JavaScript libraries
Miscellaneous
RSS
since Dec 2022
PaaS
Amazon Web Services
since Aug 2022
Programming languages
UI frameworks
Bootstrap
since Dec 2021
Web servers
Apache HTTP Server
since Dec 2021
WordPress plugins
AI Crawlers
robots.txt could not be read at the last check (Nov 2026), so its policy is unknown.
- robots.txt not checked
- llms.txt not checked
- ai.txt not checked
AI Crawlers
Policy unknown
Audience
- 83% desktop
- 17% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.75 / 10 · ranked #276,229 of all domains
114 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 25 ms |
| CLS | 0.05 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Oct 2026.
Page
- Language: Japanese
- Weight: 2.4 MB · 54 requests
- WordPress theme: education-pro · all themes
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Operations Research Society of Japan
- Country: Japan
From Wikidata (CC0).
Infrastructure
- Registered Feb 2021 (5 years) via Amazon Registrar, Inc., renews Feb 2027
- Hosted on Amazon Web Services (54.178.40.148)
- DNS: Amazon Route 53
- Email: no MX record returned
- Email security: SPF (soft fail)
- SSL: Let's Encrypt, ECDSA P256, expires Jan 2027
- Common Crawl link graph: rank 47,712, 2 hosts
- Verified with: Google
DNS records as swept Nov 2026, certificate as seen Nov 2026, registration from the registry's RDAP service. How the web is hosted
Full technology history →
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