What powers 
river.go.jp?
Last seen Oct 2026 · 30 technologies across 15 categories
Analytics
CDN
Editors
Font scripts
JavaScript frameworks
JavaScript libraries
Maps
Miscellaneous
Operating systems
PaaS
Programming languages
Security
UI frameworks
Web frameworks
Web servers
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Nov 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| river gif | #83 | 1 |
| saitama pajamas | #43 | 0 |
| m l i t japan | #40 | 0 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 95% phone
- 3% desktop
- 1% tablet
Japan
United States
South Korea
Thailand
Taiwan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
7.71 / 10 · ranked #12,973 of all domains
1,054 referring domains · OpenPageRank
Search traffic
1 est. monthly organic visits (US)
3 keywords in Google's top 30
Core Web Vitals
| LCP | 1.5 s |
| INP | 275 ms |
| CLS | 0 |
| TTFB | 1100 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 0.1 MB · 4 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Similar sites
- hyogo.lg.jp 3 shared
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Infrastructure
- DNS: d-53.info
- Email: iij-monitoring.jp
- Email security: SPF (hard fail), no DMARC record, DNSSEC signed
- SSL: Amazon Trust Services, RSA 2048, expires Apr 2027
- Common Crawl link graph: rank 56,924, 18 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.river.go.jp | 15 |
| c-sensor.river.go.jp | 7 |
| city.river.go.jp | 7 |
| frl.river.go.jp | 3 |
| s.river.go.jp | 3 |
| www5.river.go.jp | 3 |
| k.river.go.jp | 2 |
| c.river.go.jp | 1 |
| frlg.river.go.jp | 1 |
| i.river.go.jp | 1 |
| jizen.river.go.jp | 1 |
| www.i.river.go.jp | 1 |
| www1.river.go.jp | 1 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Amazon CloudFront Jun 2026
- detected Amazon Web Services Jun 2026
- dropped Akamai mPulse May 2026
- dropped Boomerang May 2026
- dropped Facebook Login Mar 2026
- dropped Leaflet Mar 2026
- dropped Livefyre Mar 2026
- dropped Snowplow Analytics Mar 2026
- dropped TurfJS Mar 2026
- detected Tailwind CSS Feb 2026
- dropped Google Tag Manager Jan 2026