← AI crawler directory

// Anthropic

Claude-User

AI answersNo fetched rangesVerified July 2026

// Overview

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.

// Headers

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

// Network

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.

// Verification

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.

// Robots.txt

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 ↗

// Analytics

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.

// FAQ

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.

// Related

Related