AI TrainerAnthropic

ClaudeBot: IP ranges, verification & how to handle it

Last verified: 2026-06-13 · maintained by Unsourced

ClaudeBot is Anthropic's crawler that collects training data for Claude. It respects robots.txt. Blocking it removes your content from what Claude learns, which can reduce future mentions.

Verified IP ranges & identity

Anthropic does not publish a machine-readable IP-range feed for ClaudeBot. The reliable way to verify it is reverse DNS: a genuine ClaudeBot request's IP reverse-resolves to anthropic.com (and that hostname forward-resolves back to the same IP).

How to verify a request is really ClaudeBot

A User-Agent string is just a claim — anyone can send ClaudeBot in a header. Confirm identity two ways: forward-confirmed reverse DNS (the IP resolves to Anthropic, and that host resolves back to the IP), and, where published, an IP inside the operator's official ranges. If neither holds, it's an impostor wearing the badge — not ClaudeBot.

Should you allow or block ClaudeBot?

Recommended: keep. Feeds model training; blocking it can quietly remove you from future AI answers.

If you do choose to act in robots.txt (which crawlers honour but don't enforce):

# ClaudeBot: recommended to ALLOW — blocking can cost you AI visibility
User-agent: ClaudeBot
Disallow:

Official sources

Anthropic crawler info: https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler ↗

Common questions about ClaudeBot

Is ClaudeBot really from Anthropic?

ClaudeBot is Anthropic's crawler, but a User-Agent header can be spoofed, so the claim alone isn't proof. Confirm it with forward-confirmed reverse DNS and, where published, a match against Anthropic's official IP ranges.

What are ClaudeBot's IP ranges?

Anthropic doesn't publish a machine-readable IP-range feed for ClaudeBot. Verify it by reverse DNS instead: a genuine request reverse-resolves to anthropic.com, and that host forward-resolves back to the same IP.

Should I block ClaudeBot?

Our recommendation: keep. Feeds model training; blocking it can quietly remove you from future AI answers.

Related crawlers

Is ClaudeBot — or an impostor — actually hitting your site?

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