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AnthropicLive fetcher

Claude-User

Claude-User is an Anthropic user-triggered fetcher for Claude answers that need a specific web page.

Reads a page when someone asks Claude about it.

Get the robots.txt ruleAnthropic documentation
Is Claude-User allowed on your site?3 Anthropic bots

Reads your live robots.txt and applies the same rules these crawlers use. Nothing is stored.

robots.txt token
Claude-User
Follows robots.txt
Yes, documented
How to verify it
Published IP ranges
Last checked
18 August 2026

Should you block Claude-User?

Usually not. It reads a page only when a person asks Claude about it, so blocking it hides your page from someone already looking for it.

What blocking each Anthropic bot does
Anthropic botJobIf you block it
ClaudeBotTrainingDisallowing ClaudeBot expresses a training-data opt-out for future compliant requests. A crawler log cannot confirm whether content entered a training dataset.
Claude-SearchBotSearchDisallowing it can reduce Claude search discovery. Allowing it does not guarantee indexing, ranking, citation, or referral traffic.
Claude-UserThis pageUser fetchDisallowing it asks the documented fetcher not to retrieve covered paths. A matching request does not prove a page was cited in a Claude answer.

From Anthropic’s documentationAnthropic says blocking Claude-User stops Claude retrieving your pages when a person asks about them.

robots.txt
User-agent: Claude-User
Disallow: /

Asks Claude-User not to crawl any page. Other Anthropic bots are unaffected. Add it to the robots.txt file at the root of your site, above any wider rules.

Ignored robots.txt?

Claude-User fires when a real user's question pulls in your page. To know how often Claude reaches for your brand at all, track your brand mentions in Claude.

To see why Claude-User access is worth checking rather than assuming, read one site’s daily record of assistants reading its pages before answering someone.

Also seen under Anthropic’s name, but not in its current documentation: Claude-Web, Claude-Code, anthropic-ai. Rules naming them control no documented Anthropic crawler.

Spot it in your logs.

Match the name, then check where the request came from. Anyone can copy a user-agent. Search your own logs for Claude-User.

User-agentsource
Claude-User

Version numbers change. Match the highlighted name, not the whole string.

  1. 1

    Match the name

    Search your server or CDN log for Claude-User, case-insensitive. A match is a clue, not proof.

  2. 2

    Check the published IP ranges

    Anthropic says IP blocking is not a durable opt-out because it can prevent the crawler from reading robots.txt. claude.com/crawling/bots.json

Is this really Claude-User?

Published addresses

Paste an address that claims to be Claude-User. It is checked against Anthropic’s published list. Nothing is stored.

Check any crawler’s address

Serve the content in HTML

The cited operator material does not verify JavaScript rendering. Serve useful HTML before client-side JavaScript where possible.

How active is Claude-User?

Measured across the sites connected to Trakkr, 27 July 2026 to 25 October 2026.

46%

of connected sites saw Claude-User in the four weeks to 25 October 2026. That is 48 of 104.

100%75%50%25%50%
Claude-User visited between 35% and 50% of connected sites each week from 27 July 2026 to 25 October 2026.

Share of connected sites it visited each week

Rank by reach
9 of 26
Typical site, per week
47 requests
Sites reached, 13 weeks
65 of 135

Most widespread AI crawlers

Share of connected sites each one visited, last four weeks.

  1. 1OAI-SearchBot84%
  2. 2ClaudeBot84%
  3. 3GPTBot67%
  4. 4Amazonbot61%
  5. 5ChatGPT-User56%
  6. 6PerplexityBot56%
  7. 7Applebot51%
  8. 9Claude-User46%
All 26 measured crawlers
How this is measured

Finalized daily crawler summaries from sites connected to Trakkr, grouped by the crawler named in each request. Trakkr’s own site is excluded. A site counts as reached in a week when it logged at least one request from Claude-User. The typical figure is the median weekly requests among the sites it reached.

  • This is a sample of connected sites, not the whole web.
  • A matching user-agent does not prove the named operator sent the request.
  • Requests are not unique pages, training use or citations.
  • Crawlers seen on fewer than 10 sites are not shown. Classic search crawlers such as Googlebot are not collected on every site, so they are left out.

Questions, answered.

Claude-User is an Anthropic user-triggered fetcher for Claude answers that need a specific web page.

Sources.

Officially documented. Operator facts and Trakkr’s measurements keep separate dates.

  1. [1]
    Anthropic crawler documentation

    Officially documented · checked 18 August 2026

    support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler

First verified 18 August 2026. Last source check 18 August 2026. Activity measured to 25 October 2026.

Changes

Anthropic confirmed its current three-bot splitAnthropic documents ClaudeBot for training, Claude-SearchBot for search, and Claude-User for user-directed retrieval.
All AI crawlers

See which AI crawlers read your site.

Trakkr shows which bots, Claude-User included, visit which pages each day, and whether the answers they feed mention you.

14-day free trial. Cancel anytime.