--- title: "Claude-User: user agent, token, block rate | Agent Ready Crawlers" description: "Claude-User from Anthropic: robots.txt token Claude-User, live answer fetch purpose and what a site can check; no exact user-agent string is published." canonical: https://agentreadycrawlers.com/crawlers/claude-user site: "Agent Ready Crawlers" last_updated: 2026-11-04 section: "Crawlers" --- # Claude-User: user agent, token, block rate | Agent Ready Crawlers > Claude-User from Anthropic: robots.txt token Claude-User, live answer fetch purpose and what a site can check; no exact user-agent string is published. Source: https://agentreadycrawlers.com/crawlers/claude-user Site: Agent Ready Crawlers Last reviewed: 2026-11-04 Live answer fetcher from Anthropic # Claude-User In short Claude-User is Anthropic's live answer fetcher. The token to write in robots.txt is Claude-User. Check a visitor against the operator's published IP list. Unlike OpenAI and Perplexity, Anthropic says its user-triggered fetcher honours robots.txt. On robots.txt, Anthropic: Claude-User allows site owners to control which sites can be accessed through user-initiated requests; disabling it stops retrieval for user queries. Operator [Anthropic](https://agentreadycrawlers.com/crawlers/operator/anthropic/) Vendor profile: [Anthropic](https://agentreadycrawlers.com/vendors/anthropic/) Purpose Live answer fetch [All live answer fetch rows](https://agentreadycrawlers.com/crawlers/purpose/live-answer-fetch/). Fetches a page because a person asked an assistant about it, one request at a time. User-agent string No exact string is published. What the operator or a third party says: Contains "Claude-User"; no full string published robots.txt token `Claude-User` Matched case-insensitively (RFC 9309). The token and the user-agent string are different things. Respects robots.txt Yes, per operator Anthropic: Claude-User allows site owners to control which sites can be accessed through user-initiated requests; disabling it stops retrieval for user queries. [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 Published IP list (JSON) Match the source address of a request against the operator's published list. [Documentation](https://claude.com/crawling/bots.json), read 2026-11-04. IP ranges [claude.com/crawling/bots.json](https://claude.com/crawling/bots.json) Rate behaviour Respects Crawl-delay where appropriate, per Anthropic. Block rate **8.1%** of 5,938 top-10,000 sites with a parsed robots.txt disallow `Claude-User` at the root (479 sites). 4.5% name it; 3.6% refuse it only through a \* group. Rank 24 of 31 tokens measured. Across all 8,624 parsed robots.txt files in the crawl: 5.7% (3.1% 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. Unlike OpenAI and Perplexity, Anthropic says its user-triggered fetcher honours robots.txt. ## Allow and refuse lines ### To allow Claude-User User-agent: Claude-User Allow: / ### To refuse Claude-User User-agent: Claude-User 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) ## In the news - 2026-10-20[Anthropic refreshes its crawler IP list](https://agentreadycrawlers.com/news/2026-10-20-anthropic-refreshes-its-crawler-ip-list/) ## Other Anthropic rows - [ClaudeBot](https://agentreadycrawlers.com/crawlers/claudebot/) Training token ClaudeBot - [Claude-SearchBot](https://agentreadycrawlers.com/crawlers/claude-searchbot/) Search index token Claude-SearchBot - [anthropic-ai (legacy token)](https://agentreadycrawlers.com/crawlers/anthropic-ai/) Training token anthropic-ai - [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 - [claude.com: bots (JSON)](https://claude.com/crawling/bots.json) read 2026-11-04 Last reviewed 2026-11-04