What is ClaudeBot?

How often is ClaudeBot impersonated?

For the median organisation, 23% of requests claiming to be ClaudeBot failed verification.

Measured between 3 July 2026 and 28 September 2026 across organisations protected by Centinel. We only publish a share when at least five organisations each saw enough of these requests. Pooled across all of their requests, the share was 4%: a few large organisations carry most of the traffic, so the median organisation is the better guide to what yours will see.

This directory measures requests between 3 July 2026 and 28 September 2026. The fake crawler report covers its own, earlier window (late June to 21 September 2026), so its figures differ from the ones here. Read it for the method.

Have a request that claims to be ClaudeBot? Check its IP address.

Should you block ClaudeBot?

Allow it if

you are content for your pages to be used in Claude model training.

Block it if

you do not want your content used for training. Use Crawl-delay instead if the only issue is load.

What blocking changes

It signals that your future content should be excluded from Anthropic's training datasets. Claude-SearchBot and Claude-User are controlled separately.

To block it, add this group to your robots.txt. Anthropic says its bots honor robots.txt and support the non-standard Crawl-delay extension.

User-agent: ClaudeBot
Disallow: /

robots.txt only asks. It does nothing against a client that ignores it or only pretends to be ClaudeBot. Stopping those takes verification at your edge.