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AI Crawler Access & TechnicalUpdated

CCBot

Also known as: Common Crawl bot, CCBot user agent

In short

CCBot is the crawler operated by Common Crawl, a non-profit that publishes a free, openly available archive of the web. Because that archive is a common source of AI training data, CCBot is often included in robots.txt decisions about AI access even though Common Crawl is not an AI company.

Indirect but broad

Most AI crawlers map to one company's product. CCBot does not: it feeds an open archive that many different projects draw on, so the effect of allowing or blocking it is diffuse rather than tied to a single assistant.

That makes the decision harder to reason about, and it is why CCBot is often handled last and least deliberately.

The trade-off

Allowing puts your content into a widely used public dataset, which is a reasonable proxy for being generally known to systems built on open data.

Blocking removes future crawls from the archive. It does not retract past archives, does not affect already-trained models, and does not stop any specific AI product that crawls independently — which most of the large ones do.

For a brand trying to be found and described accurately, blocking buys little and costs some breadth.

Where it fits in the robots.txt set

If you are stating an explicit AI policy, CCBot belongs in the list alongside GPTBot, ClaudeBot, PerplexityBot and Google-Extended — not because it is the most consequential, but because omitting one agent from an otherwise complete policy reads as an oversight rather than a decision. See robots.txt for the group-matching rules that make these blocks behave correctly.

Frequently asked questions

Should I block CCBot?
It is the least clear-cut of the AI-related crawlers. Blocking it removes you from a public archive used by researchers and many downstream projects, and the effect on any specific AI product is indirect. Most brands that want to be known allow it.
Is Common Crawl an AI company?
No. It is a non-profit publishing an open web archive that predates the current AI wave and serves researchers, academics and developers. Its data being used for model training is a downstream consequence, not its purpose.
Does blocking CCBot remove me from existing models?
No. Archives already published still contain what was crawled before, and models already trained are unaffected. Blocking only affects future crawls, which is worth understanding before treating it as a way to withdraw content.

Related terms

  • AI crawler

    An AI crawler is an automated bot that fetches web pages on behalf of an AI company, either to build a training corpus, to maintain a search index, or to retrieve a page live while answering a user's question. Each is identified by a named user agent you can allow or block in robots.txt.

  • GPTBot

    GPTBot is OpenAI's crawler for gathering publicly available web content used in training its models. It is one of three OpenAI agents: GPTBot for training, OAI-SearchBot for the search index behind ChatGPT's answers, and ChatGPT-User for fetching a page live when a user's question requires it.

  • robots.txt

    robots.txt is a plain-text file at your site root that tells automated crawlers which paths they may fetch. Each block names a user agent and lists allow and disallow rules. It is advisory rather than enforced, and it controls crawling rather than indexing or access.

  • ClaudeBot

    ClaudeBot is Anthropic's web crawler, used to gather publicly available content for Claude. A separate agent, Claude-User, fetches a specific page live when a user's request requires it. Both are identified by name in robots.txt and can be allowed or disallowed independently.

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