Anthropic · Training

ClaudeBot

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

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Key facts

User-agent token: ClaudeBot
Training: Scraped for model training or dataset development.
Anthropic publishes official IP ranges; verify requests against them.

What ClaudeBot is

ClaudeBot collects web content that may contribute to model training. Anthropic says its three documented bots honor robots.txt and share a published IP list.

In Aiola's taxonomy, Training means scraped for model training or dataset development.

ClaudeBot 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)
ClaudeBot/1.0; +https://www.anthropic.com/claudebot
Case-insensitive match token
ClaudeBot

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 ClaudeBot request

For ClaudeBot, 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 ClaudeBot with robots.txt

Anthropic documents crawler controls for this bot family. Robots.txt can direct cooperative crawling, but it cannot prove that a request is authentic.

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

Read official crawler documentation

Aiola Analytics

See every ClaudeBot visit on your site

Aiola tracks 70 AI, search and link-preview crawlers next to your human traffic. See when ClaudeBot 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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