What powers 
sendai-astro.jp?
Last seen Sep 2026 · 18 technologies across 10 categories
Analytics
CDN
Font scripts
Font Awesome
since Jan 2019
JavaScript frameworks
JavaScript libraries
Miscellaneous
Programming languages
TypeScript
since Dec 2022
UI frameworks
Element UI
since Jul 2023
Web servers
Apache HTTP Server
since Jan 2019
Widgets
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Oct 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
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
- 81% phone
- 18% desktop
- 1% tablet
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.33 / 10 · ranked #184,402 of all domains
154 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.4 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 19.1 MB · 61 requests
- Structured data: Microdata, OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Sendai Astronomical Observatory
- Country: Japan
From Wikidata (CC0).
Infrastructure
- DNS: sendai-astro.jp
- Email: sendai-astro.jp
- Email security: SPF (soft fail), no DMARC record
- SSL: JPRS, RSA 2048, wildcard, expires Jan 2027
- Common Crawl link graph: rank 2,370,691
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted