Which websites block ClaudeBot?
36 of 240 popular sites we measured block ClaudeBot (15%), checked 2026-10-01.
ClaudeBot is Anthropic’s crawler for model training crawler (Claude). Blocking it opts a site out of training data; it does not stop the retrieval crawlers that fetch pages for cited answers. More about ClaudeBot.
The robots.txt rule
To block it:
User-agent: ClaudeBot Disallow: /
To allow it explicitly:
User-agent: ClaudeBot Allow: /
A server or CDN can still refuse the crawler when robots.txt allows it. That is why the checker fetches as the crawler as well as reading the file.
Sites that block ClaudeBot
| Site | How |
|---|---|
| msn.com | robots.txt disallow |
| fbcdn.net | robots.txt disallow |
| amazon.com | robots.txt disallow |
| whatsapp.net | robots.txt disallow |
| instagram.com | robots.txt disallow |
| yahoo.com | robots.txt disallow |
| skybridge.click | robots.txt disallow |
| linkedin.com | robots.txt disallow |
| pubmatic.com | refused at the server |
| rubiconproject.com | refused at the server |
| whatsapp.com | robots.txt disallow |
| snapchat.com | robots.txt disallow |
| creativecdn.com | robots.txt disallow |
| twitter.com | robots.txt disallow |
| pinterest.com | robots.txt disallow |
| reddit.com | robots.txt disallow |
| sharethrough.com | robots.txt disallow |
| amazon.co.za | robots.txt disallow |
| netcraze.io | robots.txt disallow |
| juicyscore.com | robots.txt disallow |
| pinimg.com | robots.txt disallow |
| globalsign.com | robots.txt disallow |
| blismedia.com | refused at the server |
| t.co | robots.txt disallow |
| cornell.edu | refused at the server |
| x.com | robots.txt disallow |
| wp.com | refused at the server |
| canva.com | robots.txt disallow |
| wikipedia.com | refused at the server |
| meraki.com | robots.txt disallow |
| wikipedia.org | refused at the server |
| ad-score.com | robots.txt disallow |
| medallia.com | refused at the server |
| bidmachine.io | refused at the server |
| storygize.net | robots.txt disallow |
| starttest.com | robots.txt disallow |
Check your own site
The free checker runs the same probe on any URL: robots.txt resolved for every AI crawler, then a live fetch as each one, so a CDN or firewall block shows up even when robots.txt looks fine.
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Other crawlers
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- Sites that block ChatGPT-User
- Sites that block Claude-SearchBot
- Sites that block Claude-User
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