What powers icra.it?
Last seen Feb 2026 · 3 technologies across 3 categories
AI Crawlers
Blocks all crawlers by default in robots.txt (User-agent: *). Checked Sep 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 is blocked by the catch-all rule (User-agent: *).
- robots.txt found
- llms.txt not checked
- ai.txt not checked
AI Crawlers
All crawlers blocked
Open Page Rank
5.04 / 10 · ranked #242,530 of all domains
94 referring domains · OpenPageRank
Organisation
- International Center for Relativistic Astrophysics
- Founded: 1985
From Wikidata (CC0).
Infrastructure
- Hosted on Cloudflare (104.21.64.151, IPv6)
- DNS: Cloudflare DNS
- Email: Google Workspace
- Email security: SPF (hard fail), DMARC quarantine
- SSL: Let's Encrypt, ECDSA P256, expires Nov 2026
- Common Crawl link graph: rank 656,684, 5 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
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Recent changes
- dropped Apache HTTP Server Feb 2026
- detected Nginx Jan 2026
- dropped CentOS Oct 2025