What powers chess4u.de?

Last seen Oct 2026 · 15 technologies across 9 categories

Analytics

Vercel Analytics
since Nov 2025

Authentication

NextAuth.js
since Nov 2025

JavaScript frameworks

Next.js v14.2.30
since Nov 2025
Next.js App Router
since Nov 2025
React
since Nov 2025

Miscellaneous

Open Graph
since Apr 2023
PWA
since Nov 2025
Webpack
since Nov 2025

PaaS

Vercel
since Nov 2025

Performance

Priority Hints
since Dec 2023

Programming languages

Node.js
since Nov 2025

Security

HSTS
since Nov 2025

UI frameworks

Radix UI
since Nov 2025
shadcn/ui
since Nov 2025
Tailwind CSS
since Nov 2025

AI Crawlers

Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Oct 2026.

  • robots.txt found
  • llms.txt not found
  • ai.txt not found

See who blocks each AI crawler across the web

AI Crawlers

No AI crawlers blocked

Full breakdown

Open Page Rank

1.54 / 10 · ranked #6,166,426 of all domains

7 referring domains · OpenPageRank

Page

  • Language: German
  • CDN: Vercel
  • Weight: 0.5 MB · 42 requests
  • Structured data: OpenGraph, Twitter Cards

Homepage as crawled by the HTTP Archive, Oct 2026.

Organisation

  • chess4u Schachschule
  • Industry: Education (declares EducationalOrganization)

From the homepage's own structured data (Oct 2026).

Infrastructure

  • Hosted on Amazon Web Services (216.150.1.1)
  • DNS: webgo.de
  • Email: goserver.host
  • Email security: SPF (hard fail), DMARC quarantine
  • SSL: Let's Encrypt, RSA 2048, expires Nov 2026
  • Common Crawl link graph: rank 29,679,706, 2 hosts

DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted

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