What is CCBot? AI crawler guide
CCBot by Common Crawl: Common Crawl's crawler for building public web crawl datasets used by researchers and AI builders. Check its reported user-agent, robots.txt behavior, source, and verification guidance.
Common Crawl's crawler for building public web crawl datasets used by researchers and AI builders.
What is CCBot?
CCBot is the web crawler operated by Common Crawl, a nonprofit organization that builds and maintains a free, open repository of web crawl data. The bot systematically visits public websites to collect pages that become part of large-scale datasets. These datasets are widely used by researchers, academics, and developers for tasks like training machine learning models, analyzing web trends, and building search technologies. CCBot identifies itself with the user-agent token CCBot and respects the Robots Exclusion Protocol, meaning it follows the rules set in a site's robots.txt file. Its activity is foundational to many open-data projects and AI training pipelines that rely on broad, diverse web samples.
What it's for
For a site owner, CCBot's visits mean your content may be included in Common Crawl's publicly available datasets. This can increase the visibility of your site in research and AI applications, potentially leading to citations, traffic, or indirect benefits if downstream tools surface your content. However, if you prefer to keep your pages out of these datasets-for privacy, competitive, or bandwidth reasons-you can block the bot. Doing so will prevent your pages from appearing in future Common Crawl archives, which could limit your site's presence in AI training data and research outputs that draw from those archives.
CCBot collects pages for model training. Training inclusion is not the same as being cited, so measure where AI answers actually cite your site before drawing conclusions from crawl logs.
How to handle CCBot
To prevent CCBot from crawling your site, add a rule in your robots.txt file that disallows the user-agent CCBot for the paths you want to protect. The bot honors standard robots.txt directives, so a simple disallow rule will stop it from accessing the specified areas. If you want to allow crawling, no action is needed; CCBot will visit and include your pages in its datasets by default. Regularly check your server logs to confirm the bot's activity aligns with your intentions.
robots.txt rule
User-agent: CCBot Disallow: /
Blocking cost
Blocking CCBot may reduce your site's inclusion in widely used open datasets, potentially limiting its visibility in AI training, academic research, and tools that rely on Common Crawl data.
Examples
- A university researcher uses a Common Crawl dataset containing pages crawled by CCBot to study language patterns across millions of websites.
- An AI startup trains a large language model on text extracted from Common Crawl archives, which were built by CCBot's crawls.
- A digital librarian analyzes historical web content from Common Crawl snapshots to track how website designs have evolved over time.
Related bots
- AI2Bot: Also tracked as a training crawler.
- KimiBot: Also tracked as a training crawler.
- MistralAI-Training: Also tracked as a training crawler.
- GPTBot: Also tracked as a training crawler.
- Meta-ExternalAgent: Also tracked as a training crawler.
- ICC-Crawler: Also tracked as a training crawler.
- LAIONDownloader: Also tracked as a training crawler.
- ClaudeBot: Also tracked as a training crawler.
- TerraCotta: Also tracked as a training crawler.
- CCBot: CCBot is the glossary definition behind this crawler guide.
- AI Training Opt-Out: CCBot is a training crawler tied to this policy decision.
- GrokBot: Also tracked as a training crawler.
Frequently Asked Questions
What does CCBot do?
CCBot crawls public websites to collect data for Common Crawl's open web datasets, which are used for research, AI training, and analysis.
Does CCBot obey robots.txt?
Yes, CCBot honors the Robots Exclusion Protocol and will follow any disallow rules set for its user-agent token in a site's robots.txt file.
How can I stop CCBot from crawling my site?
Add a 'User-agent: CCBot' line followed by 'Disallow: /' (or specific paths) to your robots.txt file to block the bot from accessing your content.
Will blocking CCBot affect my site's search engine rankings?
Blocking CCBot does not directly impact search engine rankings, as it is not a search engine crawler. However, it may prevent your content from appearing in datasets used by other services.
Is CCBot associated with any commercial entity?
No, CCBot is operated by Common Crawl, a nonprofit organization dedicated to providing open access to web crawl data for public benefit.
Data & Sources
- Common Crawl documentation - Primary source for CCBot crawler details.