What powers r-letter.com?
Last seen Sep 2026 · 7 technologies across 5 categories
Analytics
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
Security
HSTS
since Sep 2022
Web servers
Apache HTTP Server
since Jun 2016
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
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.95 / 10 · ranked #3,723,058 of all domains
26 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| CLS | 0.15 |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 3.3 MB · 78 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- DNS: Muumuu Domain
- Email: no MX record returned
- SSL: Amazon Trust Services, RSA 2048, wildcard, expires Mar 2027
- Common Crawl link graph: rank 1,238,232, 2 hosts
DNS records as swept Aug 2026, certificate as seen Sep 2026. How the web is hosted