What powers ro-calc.de?
Last seen Sep 2026 · 3 technologies across 2 categories
JavaScript libraries
Web servers
Nginx
since Sep 2020
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
Thailand
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
0.48 / 10 · ranked #25,950,100 of all domains
1 referring domains · OpenPageRank
Core Web Vitals
| LCP | 3.7 s |
| INP | 225 ms |
| CLS | 0 |
| TTFB | 1200 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Weight: 3.1 MB · 163 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on netcup (188.68.47.190, IPv6)
- DNS: netcup.net
- Email: no MX record returned
- Email security: SPF (soft fail)
- SSL: Let's Encrypt, RSA 4096, expires Nov 2026
- Common Crawl link graph: rank 10,760,296
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted