What powers city.chuo.tokyo.jp?
Last seen Sep 2026 · 7 technologies across 6 categories
JavaScript libraries
Miscellaneous
Programming languages
Web frameworks
Web servers
Widgets
AI Crawlers
Blocks 5 of 33 AI crawlers we track by name in its robots.txt. Checked Sep 2026.
Training crawlers
- ClaudeBot Blocked
- GPTBot Blocked
- meta-externalagent Blocked
Search and AI assistants
- Amazonbot Blocked
- PerplexityBot Blocked
The other 28 AI crawlers we track are not mentioned and only inherit the catch-all rules that apply to every crawler.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Aug 2026 perplexitybot added to robots.txt
AI Crawlers
5 of 33 AI crawlers blocked
Audience
- 68% phone
- 30% desktop
- 1% tablet
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.68 / 10 · ranked #375,485 of all domains
88 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.3 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 1000 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 0.6 MB · 36 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- DNS: Amazon Route 53
- Email: no MX record returned
- SSL: GlobalSign, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 487,513, 8 hosts
DNS records as swept Aug 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.library.city.chuo.tokyo.jp | 7 |
| library.city.chuo.tokyo.jp | 5 |