Should you block CCBot? What it does and doesn't stop

CCBot is operated by the Common Crawl Foundation, a nonprofit that publishes a large, open web corpus reused by many third-party researchers and model trainers — not a single company’s product crawler.

What blocking CCBot does

Disallowing CCBot prevents the Common Crawl Foundation’s own crawler from adding your content to future snapshots of its open corpus.

What blocking CCBot does not do

• It has no effect on content already captured in prior Common Crawl snapshots, which remain published and reusable regardless of a later robots.txt change.
• It has no effect on any other operator’s own crawler (GPTBot, ClaudeBot, and so on) — each is evaluated independently against your robots.txt.
• It does not identify or control which downstream organisations use the Common Crawl corpus for their own model training — that reuse happens outside CrawlPact’s or the Common Crawl Foundation’s visibility.

The decision

If your objective is specifically “reduce future inclusion in a widely-reused open dataset,” disallowing CCBot is the direct, effective action. If your objective is “prevent my content from ever being used to train any AI model,” blocking CCBot alone is not sufficient — the research purpose category on this crawler reflects that its data has a wider downstream reach than a single operator’s own training pipeline, and CrawlPact cannot verify or enumerate every downstream reuse.

See /limitations for what a robots.txt rule can and cannot guarantee, or check whether your own site currently allows or blocks CCBot with the AI crawler checker.