ClaudeBot

Operator

Anthropic

Type

AI Data Scraper

Official page

support.claude.com

robots.txt token

ClaudeBot

Follows robots.txt

Yes, according to Anthropic.

Published IP ranges

claude.com/crawling/bots.json

In Vireo

Excluded, reported under AI crawlers

What it does

Collects web content that could be used to train Anthropic's generative AI models.

ClaudeBot helps enhance the utility and safety of our generative AI models by collecting web content that could potentially contribute to their training.

Anthropic

User agent

Requests from ClaudeBot carry a user agent like this:

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +ClaudeBot@anthropic.com)

Device Detector identifies it with this pattern (a case-insensitive regular expression):

ClaudeBot|Anthropic-Claude

Anyone can put any name in a user agent. Where the operator publishes IP ranges, checking the request's address against them is the way to confirm a visit is genuine.

How to block or allow ClaudeBot

Add a group for its token to the robots.txt file at the root of your site. To keep it out of the whole site:

User-agent: ClaudeBot
Disallow: /

To let it crawl everything, use an empty Disallow: or Allow: / instead. WordPress serves a virtual robots.txt that many SEO plugins let you edit. A real robots.txt file uploaded to the site root takes its place.

User-agent: ClaudeBot Disallow: /

Anthropic

Anthropic’s Bots respect “do not crawl” signals by honoring industry standard directives in robots.txt.

Anthropic

robots.txt is a request, so it only works on crawlers that honour it. A bot that ignores it has to be blocked at the server or firewall, by user agent or IP address.

Worth knowing

Supports Crawl-delay. Anthropic says blocking its IPs may not work as an opt-out because it stops the bot reading robots.txt.

To limit crawling activity, we support the non-standard Crawl-delay extension to robots.txt.

Anthropic

How Vireo counts ClaudeBot

Vireo keeps requests from ClaudeBot out of your pageviews and visitors and counts them on its bot report under AI crawlers, so you can see how much it left out rather than wonder why your server logs show more traffic.

Because it's an AI crawler, its requests also count toward the pages AI crawlers took, which Vireo shows next to the readers AI assistants sent back. See how the AI assistants card works.

Checked by running Vireo Analytics' own bot filter over ClaudeBot's user agents.

Sources

• Anthropic: crawler documentation (checked October 2026)
• Matomo Device Detector, bots.yml (LGPL-3.0)
• ai.robots.txt (MIT)