What powers cfel.de?
Last seen Sep 2026 · 6 technologies across 5 categories
Analytics
Matomo Analytics
since Jun 2022
Font scripts
JavaScript graphics
JavaScript libraries
Security
HSTS
since Sep 2022
AI Crawlers
Blocks 32 of 33 AI crawlers we track by name in its robots.txt. Checked Oct 2026.
Training crawlers
- AI2Bot Blocked
- Applebot-Extended Blocked
- Bytespider Blocked
- CCBot Blocked
- ClaudeBot Blocked
- cohere-training-data-crawler Blocked
- Diffbot Blocked
- FacebookBot Blocked
- Google-CloudVertexBot Blocked
- Google-Extended Blocked
- GoogleOther Blocked
- GPTBot Blocked
- ImagesiftBot Blocked
- img2dataset Blocked
- meta-externalagent Blocked
- PanguBot Blocked
- SBIntuitionsBot Blocked
- Webzio-Extended Blocked
Search and AI assistants
- Amazonbot Blocked
- Applebot Blocked
- Claude-SearchBot Blocked
- DuckAssistBot Blocked
- OAI-SearchBot Blocked
- PerplexityBot Blocked
- PetalBot Blocked
- YouBot Blocked
User-request fetchers
- ChatGPT-User Blocked
- Claude-User Blocked
- GoogleAgent-Mariner Blocked
- meta-externalfetcher Blocked
- MistralAI-User Blocked
- Perplexity-User Blocked
The other 1 AI crawler we track is not mentioned and only inherits the catch-all rules that apply to every crawler.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Aug 2026 chatgpt-user added to robots.txt
- Aug 2026 claude-searchbot added to robots.txt
- Aug 2026 claude-user added to robots.txt
- Aug 2026 claude-web added to robots.txt
- Aug 2026 applebot added to robots.txt
- Aug 2026 claudebot added to robots.txt
AI Crawlers
32 of 33 AI crawlers blocked
Open Page Rank
4.15 / 10 · ranked #479,776 of all domains
81 referring domains · OpenPageRank
Page
- Language: English
- Weight: 0.8 MB · 35 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Center for Free-Electron Laser Science
- Founded: 1895
- Country: Germany
From Wikidata (CC0).
Infrastructure
- Hosted on DESY-HAMBURG (131.169.64.33)
- DNS: desy.de
- Email: dfn.de
- Email security: SPF (soft fail), DMARC monitor only
- SSL: Let's Encrypt, RSA 4096, expires Dec 2026
- Common Crawl link graph: rank 592,465, 20 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| ufox.cfel.de | 6 |
| atto.cfel.de | 5 |
| cid.cfel.de | 5 |
| www.cfel.de | 5 |
| conferences.cfel.de | 4 |