Anthropic · AI answers

Claude-User

Identify Claude-User by its user agent. Check request identity, review robots.txt controls and track visits in Aiola Analytics.

Download AiolaAI crawler directory

Key facts

User-agent token: Claude-User
AI answers: Fetched to answer a user's question now.
Anthropic publishes official IP ranges; verify requests against them.

What Claude-User is

Claude-User retrieves pages for user requests in Claude. Anthropic says its three documented bots honor robots.txt and share a published IP list.

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

Claude-User 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.

Example User-Agent (unverified)
Claude-User/1.0
Case-insensitive match token
Claude-User

Official IP ranges

Anthropic publishes an official IP range list. This cached snapshot contains 14 CIDR prefixes, last fetched 2026-10-23. Open the live source

Official IP range snapshot
136.79.143.251/32
136.83.20.215/32
216.73.216.0/22
34.152.124.140/32
34.153.21.190/32
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
34.162.27.34/32
34.162.86.102/32
34.162.90.102/32
34.186.252.4/32

Verify a Claude-User request

For Claude-User, compare the source IP from your trusted edge or server against Anthropic’s current published prefixes.

Test one CIDR in Python (replace REQUEST_IP)
python3 -c 'import ipaddress; print(ipaddress.ip_address("REQUEST_IP") in ipaddress.ip_network("136.79.143.251/32"))'

Test every current prefix in the vendor feed and re-fetch it regularly. This cached snapshot is evidence of publication, not a permanent firewall list.

Control Claude-User 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 official crawler documentation

Aiola Analytics

See every Claude-User visit on your site

Aiola tracks 70 AI, search and link-preview crawlers next to your human traffic. See when Claude-User arrives, which pages it requests and how that changes over time. Hosted Analytics needs Pro or a trial.

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Aiola Analytics showing AI crawler visits by bot and page

Common questions

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