ClaudeBot is Anthropic's AI training crawler: it collects pages to train AI models. It is the #4 most blocked of the 29 AI crawlers in the index.

How do I block ClaudeBot in robots.txt?

Add these lines to https:// /robots.txt: "User-agent: ClaudeBot" followed by "Disallow: /". To allow it, use "Allow: /" instead. Well-behaved crawlers read robots.txt before fetching pages; firewall rules are needed to stop crawlers that ignore it.

How do I check whether my site blocks ClaudeBot?

Use the free AI crawler checker at tools.yukai.uk/free/ai-crawler-checker: it shows the status of ClaudeBot and 28 other AI crawlers with the exact robots.txt rule.

AI crawler · Anthropic · Training

Which websites block ClaudeBot?

As of 2026-10-01, 139 of the 853 popular websites whose robots.txt we could read (16.3%) block ClaudeBot, Anthropic's AI training crawler, on the home page; 42 more block it on some paths. Among the top 100 sites: 22.9%.

16.3%

of 853 readable sites block ClaudeBot

22.9%

of the top 100

most blocked of 29 AI crawlers

672

sites allow it on the home page

Blocked by category

Category	Sites read	Block ClaudeBot
News & media	126	49.2%
Social	48	27.1%
Reference	43	23.3%
Travel	13	23.1%
E-commerce	58	12.1%
Other	260	10.8%
Entertainment	68	8.8%
Government	33	6.1%
Tech	154	5.2%
AI	9	0%
Education	20	0%
Finance	16	0%
Telecom	5	0%

Trend

The daily series for ClaudeBot starts on 2026-10-01; a trend appears here as days accumulate.

Latest changes

dailymotion.com: blocked → allowed
mamastar.jp: allowed → partial
eff.org: allowed → partial
scientificamerican.com: allowed → blocked

Block or allow ClaudeBot

User-agent: ClaudeBot
Disallow: /

Replace Disallow: / with Allow: / to let it in. A site that blocks training crawlers but wants to be cited in AI answers usually keeps the search and user-triggered crawlers allowed.

FAQ

How many websites block ClaudeBot?: As of 2026-10-01, 139 of the 853 popular websites whose robots.txt we could read (16.3%) block ClaudeBot, Anthropic's AI training crawler, on the home page; 42 more block it on some paths. Among the top 100 sites: 22.9%.
What is ClaudeBot?: ClaudeBot is Anthropic's AI training crawler: it collects pages to train AI models. It is the #4 most blocked of the 29 AI crawlers in the index.
How do I block ClaudeBot in robots.txt?: Add these lines to https://<your-site>/robots.txt: "User-agent: ClaudeBot" followed by "Disallow: /". To allow it, use "Allow: /" instead. Well-behaved crawlers read robots.txt before fetching pages; firewall rules are needed to stop crawlers that ignore it.
How do I check whether my site blocks ClaudeBot?: Use the free AI crawler checker at tools.yukai.uk/free/ai-crawler-checker: it shows the status of ClaudeBot and 28 other AI crawlers with the exact robots.txt rule.

Other AI crawlers

Also from Anthropic: Claude-SearchBot (8.1%), Claude-User (8.3%).