What is ClaudeBot? AI crawler guide
ClaudeBot is a crawler or fetcher associated with Anthropic. See source-graded user-agent, robots.txt, verification, and observation guidance.
What is ClaudeBot?
ClaudeBot is a documented Anthropic crawler or fetcher. Anthropic crawler for public web content that could contribute to Claude model training.
Evidence status
| Field | Value |
|---|---|
| Evidence | Officially documented |
| Lifecycle | Active |
| Purpose | training |
| robots.txt posture | honors |
| Source checked | 2026-08-18 |
Documented user-agent
Mozilla/5.0 (compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
Allowing ClaudeBot creates the possibility of retrieval. To find out whether Claude actually cites or recommends you, track your Claude mentions over time.
robots.txt allow example
User-agent: ClaudeBot Allow: /
robots.txt block example
User-agent: ClaudeBot Disallow: /
What the rule can and cannot do
Robots.txt expresses an access policy to compliant automated crawlers. It does not authenticate the sender, remove content already collected, or guarantee that a model will use or not use content.
How to verify a request
- Match the complete documented user-agent where one exists. A match is only a clue.
- Use the operator-published check: Published IP ranges.
- Keep the observed request, operator documentation, and any inference as separate fields.
Observed in Trakkr connected-site data
| Measure | Value |
|---|---|
| Matching signature | ClaudeBot |
| Classified requests | 568865 |
| Sites in sample | 85 |
| Window | 2026-07-18 through 2026-08-17 |
| Method | Finalized daily crawler summaries from connected Trakkr sites, grouped by the crawler signature detected in each request. |
| Limits | This is a connected-site sample, not a representative sample of the web. A matching user-agent or signature does not prove that the named operator sent the request. Counts describe classified request signatures, not market share or unique pages crawled. |
JavaScript behavior
The cited operator material does not verify JavaScript rendering. Serve useful HTML before client-side JavaScript where possible.
Related bots
- Webzio-Extended: Also tracked as a training crawler.
- CCBot: Also tracked as a training crawler.
- GPTBot: Also tracked as a training crawler.
- KimiBot: Also tracked as a training crawler.
- AI2Bot: Also tracked as a training crawler.
- MistralAI-Training: Also tracked as a training crawler.
- VelenPublicWebCrawler: Also tracked as a training crawler.
- img2dataset: Also tracked as a training crawler.
- Bytespider: Also tracked as a training crawler.
- AI Training Opt-Out: ClaudeBot is a training crawler tied to this policy decision.
- Anthropic-AI: ClaudeBot connects this operator term to its crawler behavior.
Frequently Asked Questions
What is ClaudeBot?
ClaudeBot is a officially documented crawler or fetcher record associated with Anthropic.
What user-agent does ClaudeBot use?
Mozilla/5.0 (compatible; ClaudeBot/1.0; +claudebot@anthropic.com). Check the evidence status before attributing a matching request.
Can ClaudeBot be blocked in robots.txt?
The record identifies ClaudeBot as the token to review. Robots.txt is a request policy, not proof of model use or non-use.
How can I verify a ClaudeBot request?
Start with the full user-agent, then use published ip ranges from the operator. A user-agent match alone is not proof.
Data & Sources
- Anthropic documentation - Primary source for ClaudeBot crawler details.
- ClaudeBot verification: Published IP ranges - Anthropic says IP blocking is not a durable opt-out because it can prevent the crawler from reading robots.txt.