What powers jssr.jp?
Last seen Aug 2026 · 4 technologies across 3 categories
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Sep 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| sleep in japan | #90 | 1 |
| psg scoring | #10 | 0 |
| japanese sleep | #73 | 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
- 60% desktop
- 40% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.88 / 10 · ranked #119,167 of all domains
186 referring domains · OpenPageRank
Search traffic
1 est. monthly organic visits (US)
3 keywords in Google's top 30
Core Web Vitals
| LCP | 0.9 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 2.9 MB · 80 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Japanese Society of Sleep Research
- Country: Japan
From Wikidata (CC0).
Infrastructure
- Hosted on INFOSPHERE NTT PC Communications, Inc. (203.138.26.26)
- DNS: sphere.ad.jp
- Email: jssr.jp
- Email security: SPF (hard fail), DMARC monitor only
- SSL: GlobalSign, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 578,941, 2 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| jssr.jp | 4 |
| www.jssr.jp | 4 |