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Anthropic

Claude-User

AI answersNo fetched rangesVerified July 2026

What it is

Claude-User retrieves a page in response to a person's request inside Claude. Aiola classifies it as AI answers because access happens on demand.

In Aiola's taxonomy, AI answers means fetched to answer a user's question now.

User agent

Look for the match token inside the complete HTTP User-Agent header. Tokens can be spoofed, so use the network checks below for authentication.

Full example User-Agent
Claude-User/1.0
Case-insensitive match token
Claude-User

Official IP ranges

Anthropic has not published official IP ranges that Aiola successfully fetched for Claude-User. Aiola does not list cloud-provider ranges or community guesses as if they authenticated this crawler.

Verify authenticity

Start with the source IP recorded by your trusted edge or server, not an untrusted forwarded header.

Reverse- and forward-DNS double lookup
host REQUEST_IP
# Confirm the hostname ends in an official suffix
host RETURNED_HOSTNAME
# The forward lookup must return REQUEST_IP

For production checks, test against every current prefix in the vendor feed. Re-fetch feeds regularly: a July 2026 snapshot is evidence of publication, not a permanent firewall list.

Control it with robots.txt

Claude-User is user-triggered. Anthropic's controls may differ from automated crawling, so do not assume a robots.txt block is an authentication boundary.

Allow Claude-User
User-agent: Claude-User
Allow: /
Block Claude-User
User-agent: Claude-User
Disallow: /

Read Anthropic's official crawler documentation ↗

Track it

Aiola tracks this crawler on your site — crawls, pages, trends. See when Claude-User arrives, which URLs it requests, and how activity changes over time.

Explore Aiola Analytics

FAQ

What is Claude-User?

Claude-User retrieves a page in response to a person's request inside Claude. Aiola classifies it as AI answers because access happens on demand.

What user-agent token identifies Claude-User?

Match the case-insensitive token “Claude-User” in the User-Agent header. A matching header alone does not authenticate the sender.

Can I verify Claude-User by IP address?

No official Claude-User CIDR snapshot was successfully fetched for this verification date. Do not treat an arbitrary cloud IP as proof of identity.

Can robots.txt block Claude-User?

Claude-User is user-triggered. Anthropic's controls may differ from automated crawling, so do not assume a robots.txt block is an authentication boundary. Use the specific “Claude-User” group when you want a rule for this identity without changing rules for every crawler.

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