Claude-User
Claude-User is a bot operated by Anthropic that fetches single pages on demand for an AI assistant. Claude-User is dispatched by Anthropic's Claude AI assistant in response to user prompts, when it needs to fetch content to include in its answers. It honours robots.txt, and a request claiming to be Claude-User can be checked against a published IP range file.
Claude-User at a glance
| User agent | Mozilla/5.0 (compatible; Claude-User/1.0; [email protected]) |
|---|---|
| Operator | Anthropic |
| Purpose | Assistant fetchers |
| Respects robots.txt | Yes, documentedsource |
| Verification method | Published IP range file Fired when a Claude user asks about a specific page, so it arrives one URL at a time. Covered by the same published prefix file as ClaudeBot. https://claude.com/crawling/bots.json |
| Crawl pattern | Not published |
| Robots.txt tokens | Claude-User |
| Operator documentation | https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler |
Claude-User is dispatched by Anthropic's Claude AI assistant in response to user prompts, when it needs to fetch content to include in its answers.
Allow or block Claude-User
Paste one of these into the robots.txt file at the root of your domain. Rules are per token, so a block on one crawler leaves every other bot untouched.
User-agent: Claude-User
Disallow: /Blocks every path for this crawler only.
User-agent: Claude-User
Allow: /Explicit allow. Useful when a wildcard rule above it would otherwise catch this crawler.
User-agent: Claude-User
Allow: /
Disallow: /account/
Disallow: /checkout/
Disallow: /searchEdit the Disallow paths to match your own account, checkout and search URLs.
What blocking actually costs you
Blocking Claude-User means a person who asks about one of your URLs gets an error instead of a summary. That is a support and reputation trade-off, not a training one.
Block every crawler in the directory at onceIs that really Claude-User?
A user-agent header is a string the client chooses. Scrapers copy Claude-User precisely because site owners allow it. Fired when a Claude user asks about a specific page, so it arrives one URL at a time. Covered by the same published prefix file as ClaudeBot.
Paste the IP address from your access log below. You will see whether it belongs to a hosting provider, a residential proxy pool or a Tor exit, plus the ASN that announces it, which is what tells you whether the claim holds up.
Other crawlers run by Anthropic
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Identify crawlers automatically instead of by hand
Agentscan checks a request against published crawler ranges, reverse DNS and hosting data, then returns a verdict your edge can act on. One call per request, no range files to keep up to date.