INGDG

Claude-User (Anthropic)

Fetches on user request

What it is

Claude-User accesses websites when people ask Claude questions. Anthropic says disabling it prevents Claude from retrieving your content in response to a user query, which may reduce your site’s visibility for user-directed web search. It is not the training crawler — that is ClaudeBot.

Official documentation: support.claude.com · checked 13 Nov 2026

Claude-User user agent

Anthropic does not publish a full user agent string for Claude-User, only the token. Look for “Claude-User” in your logs and in robots.txt.

Official documentation: support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler · checked 13 Nov 2026

Block or allow Claude-User in robots.txt

Put these lines at the top of the robots.txt file in your site’s root (example.com/robots.txt). Each subdomain needs its own file.

Block Claude-User from the whole site
User-agent: Claude-User
Disallow: /
Block Anthropic’s training, stay in its search
User-agent: ClaudeBot
Disallow: /

Closes ClaudeBot. Claude-SearchBot, Claude-User stay under your general rules, so your pages can still appear in answers and results.

Allow Claude-User
User-agent: Claude-User
Allow: /
# repeat here the Disallow lines of your User-agent: * group

If Claude-User is not named in robots.txt, it already follows your User-agent: * rules, so you don’t need anything. A group of its own replaces the * group for this bot entirely: if you add one, repeat your general Disallow lines in it.

  • Anthropic asks you to add the rule for every subdomain you want to opt out.

Claude-User IP ranges

claude.com/crawling/bots.json

Official list: 14 ranges · published by the owner 20 Oct 2026 · we checked it 13 Nov 2026

Anthropic publishes one list for all its bots — ClaudeBot, Claude-User and Claude-SearchBot.

Check an IP from your logs

Show all 14
  • 34.152.124.140/32
  • 34.153.21.190/32
  • 34.162.27.34/32
  • 34.162.86.102/32
  • 34.162.90.102/32
  • 34.162.111.78/32
  • 34.162.153.71/32
  • 34.162.191.81/32
  • 34.162.230.222/32
  • 34.162.244.71/32
  • 34.186.252.4/32
  • 136.79.143.251/32
  • 136.83.20.215/32
  • 216.73.216.0/22

Does it respect robots.txt and Crawl-delay?

robots.txt: yes, Claude-User follows it according to its owner.

“Claude-User allows site owners to control which sites can be accessed through these user-initiated requests.” — Anthropic documentation

Crawl-delay: supported for Claude-User.

“we support the non-standard Crawl-delay extension to robots.txt” — Anthropic documentation

Should you block Claude-User?

Usually no. Claude-User opens a page only when a person asks Anthropic’s assistant about it, and the answer can link back to you. Blocking it means the assistant cannot read your page for that person.

Check your site

See whether your robots.txt and firewall let Claude-User in — together with every other AI bot in this directory. Free, no sign-up.

Other Anthropic bots

Questions

What is the Claude-User user agent string?+

Anthropic does not publish a full user agent string for Claude-User. Match the token “Claude-User” instead.

How do I block Claude-User in robots.txt?+

Add a group for it to robots.txt in your site’s root: “User-agent: Claude-User” followed by “Disallow: /”.

What IP addresses does Claude-User use?+

Anthropic publishes 14 ranges at https://claude.com/crawling/bots.json. Requests that call themselves Claude-User from other addresses are most likely fake.

Does Claude-User respect robots.txt?+

robots.txt: yes, Claude-User follows it according to its owner.

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