# ClaudeBot

> Anthropic's bulk crawler, gathering pages that may be used to train Claude models.

| field | value |
|---|---|
| operator | Anthropic |
| category | AI training crawlers |
| robots.txt token | `ClaudeBot` |
| user-agent contains | `ClaudeBot` |
| robots.txt | obeys robots.txt (documented) |
| verify by | no published verification method |
| published IP ranges | none published |
| prefixes mirrored | 0 IPv4 / 0 IPv6 |
| operator docs | https://support.anthropic.com/en/articles/8896518 |
| last reviewed | 2026-09-01 |

## What blocking it costs you

Content excluded from training data for future Claude models. No effect on Claude's ability to fetch a link a user gives it.

## Full user-agent string

```
Mozilla/5.0 (compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
```

## Block it

```
User-agent: ClaudeBot
Disallow: /
```

## Allow it

```
User-agent: ClaudeBot
Allow: /
```

JSON: https://www.pathwren.workers.dev/crawler/claudebot.json · index: https://www.pathwren.workers.dev/llms.txt