# ClaudeBot

## In short

ClaudeBot is an AI crawler operated by Anthropic. Its robots.txt token is ClaudeBot, and the vendor documentation we fetched on 2026-09-17 is the source for every statement on this page.

| Fact | Value |
| --- | --- |
| Robots token | ClaudeBot |
| Vendor | Anthropic |
| Purpose | training corpus |
| Documented verification | published IP ranges |
| Vendor documentation last verified | 2026-09-17 |
| Share of read domains disallowing it for / | 12.7% of 12976 |
| Last verified | 2026-09-17 |

## Does ClaudeBot obey robots.txt?

The vendor documentation at https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler states that ClaudeBot respects robots.txt. We fetched that page and it answered our checker on 2026-09-17. This records what the vendor documents, not what any individual request did.

## How do I allow ClaudeBot in robots.txt?

Add this group to the robots.txt at the root of the host: User-agent: ClaudeBot
Allow: /. The token is matched case insensitively as a substring of the user agent by RFC 9309, and the longest matching rule wins.

## How do I disallow ClaudeBot in robots.txt?

Add this group to the robots.txt at the root of the host: User-agent: ClaudeBot
Disallow: /. A robots.txt rule is a request that a well behaved crawler honours; it is not an access control.

## How do I verify a request really came from ClaudeBot?

The vendor publishes the IP ranges this crawler fetches from at https://claude.com/crawling/bots.json. Check the address of the request against that file. A user agent string on its own proves nothing, because anyone can send one.

## Source

- https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler (HTTP 200, Verified 2026-09-17)
- https://claude.com/crawling/bots.json (HTTP 200, Verified 2026-09-17)
- https://darkvisitors.com/agents/claudebot (HTTP 200, Verified 2026-09-06)

All 21 documented crawlers: https://bikoosh.com/aeo/crawlers
Build a robots.txt with ClaudeBot and every other documented token: https://bikoosh.com/aeo/robots-builder

AEO Watch is an independent, factual monitor. It is not affiliated with, endorsed by or speaking for any crawler vendor. Every statement is an observation with the date it was made and the raw evidence behind it: a robots.txt line, an HTTP status code, a header. There are no scores, no grades and no verdicts here, and nothing on this page is advice. A site opts out at any time and the opt out is honoured automatically and permanently.