What powers mailopen.jp?
Last seen Aug 2026 · 5 technologies across 5 categories
Development
Microsoft Visual Studio
since Feb 2023
Operating systems
Windows Server
since Mar 2020
Security
HSTS
since May 2024
Web frameworks
Web servers
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
Infrastructure
- Hosted on IDCF IDC Frontier Inc. (203.137.95.6)
- Email: mailopen.jp
- Email security: SPF (soft fail), no DMARC record
DNS records as swept Sep 2026. How the web is hosted