What powers opac.jp?
Last seen Jun 2026 · 14 technologies across 11 categories
Analytics
Google Analytics
since Jul 2022
CMS
Databases
MariaDB
since Jun 2023
Ecommerce
Amazon SES
since Jan 2026
JavaScript frameworks
React
since Jul 2022
JavaScript libraries
Miscellaneous
Open Graph
since Aug 2023
PaaS
Amazon Web Services
since Jan 2026
Programming languages
Java
since Jun 2023
Web servers
Apache HTTP Server
since Apr 2019
Apache Tomcat
since Jun 2023
Audience
Japan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
6.87 / 10 · ranked #52,690 of all domains
373 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Japanese
- Weight: 0.6 MB · 39 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| aero-library.opac.jp | 11 |
| ashikaga-univ.opac.jp | 11 |
| edo-tokyo-museum-lib.opac.jp | 10 |
| gotolibrary.opac.jp | 10 |
| ike-libfk.opac.jp | 10 |
| intnl-comm-c.opac.jp | 10 |
| kaichi-u.opac.jp | 10 |
| kansaisoka.opac.jp | 10 |
| kgulib.opac.jp | 10 |
| kichijo-joshi.opac.jp | 10 |
| koyasan.opac.jp | 10 |
| kunlibrary.opac.jp | 10 |
| lib-seian.opac.jp | 10 |
| libhijiyama-u.opac.jp | 10 |
| library-takasaki-u.opac.jp | 10 |
| matsumoto-u.opac.jp | 10 |
| nisikyu-u-library.opac.jp | 10 |
| okuraken-lib.opac.jp | 10 |
| oya-bunko.opac.jp | 10 |
| sakawa-lib.opac.jp | 10 |
| sitlib.opac.jp | 10 |
| u-nagano-lib.opac.jp | 10 |
| fuksi-kagk-u.opac.jp | 9 |
| gakusen.opac.jp | 9 |
Full technology history →
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Recent changes
- detected Amazon SES Jan 2026
- detected Amazon Web Services Jan 2026