--- title: "anthropic-ai: user agent, token, block rate | Agent Ready Crawlers" description: "anthropic-ai from Anthropic: robots.txt token anthropic-ai, training purpose and what a site can check; no exact user-agent string is published." canonical: https://agentreadycrawlers.com/crawlers/anthropic-ai site: "Agent Ready Crawlers" last_updated: 2026-11-04 section: "Crawlers" --- # anthropic-ai: user agent, token, block rate | Agent Ready Crawlers > anthropic-ai from Anthropic: robots.txt token anthropic-ai, training purpose and what a site can check; no exact user-agent string is published. Source: https://agentreadycrawlers.com/crawlers/anthropic-ai Site: Agent Ready Crawlers Last reviewed: 2026-11-04 Training crawler from Anthropic # anthropic-ai (legacy token) In short anthropic-ai (legacy token) is Anthropic's training crawler. The token to write in robots.txt is anthropic-ai. The operator publishes nothing a site can check. 15.5 percent of 5,938 top-10,000 sites with a parsed robots.txt disallow it at the root (crawl of 2026-11-04). On robots.txt, not listed on Anthropic's current crawler page, which names only ClaudeBot, Claude-User and Claude-SearchBot (checked 2026-11-04). Operator [Anthropic](https://agentreadycrawlers.com/crawlers/operator/anthropic/) Vendor profile: [Anthropic](https://agentreadycrawlers.com/vendors/anthropic/) Purpose Training [All training rows](https://agentreadycrawlers.com/crawlers/purpose/training/). Collects content to train or tune a model. Refusing it is the training opt-out. User-agent string No exact string is published. What the operator or a third party says: No current request string; legacy robots.txt token only robots.txt token `anthropic-ai` Matched case-insensitively (RFC 9309). The token and the user-agent string are different things. Respects robots.txt Not on current operator page Not listed on Anthropic's current crawler page, which names only ClaudeBot, Claude-User and Claude-SearchBot (checked 2026-11-04). [Source](https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler), read 2026-11-04. Verification Nothing published The operator publishes no list, reverse DNS pattern or key directory a site owner can check. [Documentation](https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler), read 2026-11-04. IP ranges Not published. Rate behaviour Not documented. Block rate **15.5%** of 5,938 top-10,000 sites with a parsed robots.txt disallow `anthropic-ai` at the root (918 sites). 11.7% name it; 3.8% refuse it only through a \* group. Rank 10 of 31 tokens measured. Across all 8,624 parsed robots.txt files in the crawl: 11.6% (8.9% named). Crawl of 2026-11-04; [report](https://agentreadycrawlers.com/block-rates/). Documentation [support.claude.com](https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler), read 2026-11-04. Note. Still common in published robots.txt files; the shared crawl tests it. A Disallow for anthropic-ai alone does not cover ClaudeBot. ## Allow and refuse lines ### To allow anthropic-ai User-agent: anthropic-ai Allow: / ### To refuse anthropic-ai User-agent: anthropic-ai Disallow: / Refusing or allowing in robots.txt states a preference. Enforcement of a refusal belongs in your WAF; see how to verify the identity above. ## Anthropic in the Verification Ledger One shared IP list for all three bots; no key directory at claude.ai or claude.com (404, 2026-11-04); nothing for Claude in Chrome. [All operators](https://agentreadycrawlers.com/verification/). IP lists - [claude.com/crawling/bots.json](https://claude.com/crawling/bots.json) Reverse DNS publishes nothing Key directory publishes nothing Cloudflare not confirmed on Radar (directory slug not found, 2026-11-04) Visa TAP registry no public operator-level registration found (checked 2026-11-04) Mastercard Agent Pay no public operator-level registration found (checked 2026-11-04) ## Other Anthropic rows - [ClaudeBot](https://agentreadycrawlers.com/crawlers/claudebot/) Training token ClaudeBot - [Claude-User](https://agentreadycrawlers.com/crawlers/claude-user/) Live answer fetch token Claude-User - [Claude-SearchBot](https://agentreadycrawlers.com/crawlers/claude-searchbot/) Search index token Claude-SearchBot - [Claude in Chrome](https://agentreadycrawlers.com/crawlers/claude-in-chrome/) Task agent no token - [Claude Duet cloud browser](https://agentreadycrawlers.com/crawlers/claude-duet/) Task agent token Claude-Agent - [Claude computer use (API tool)](https://agentreadycrawlers.com/crawlers/claude-computer-use/) Task agent no token ## Sources - [Does Anthropic crawl data from the web, and how can site owners block the crawler?](https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler) read 2026-11-04 Last reviewed 2026-11-04