# CCBot

> Common Crawl's corpus builder. It trains nothing itself, but its archive is an input to most open and many closed LLM training sets, which makes it the highest-leverage single entry on this list.

| field | value |
|---|---|
| operator | Common Crawl |
| category | Corpus and dataset builders |
| robots.txt token | `CCBot` |
| user-agent contains | `CCBot` |
| robots.txt | obeys robots.txt (documented) |
| verify by | published IP ranges |
| published IP ranges | https://index.commoncrawl.org/ccbot.json |
| prefixes mirrored | 4 IPv4 / 1 IPv6 |
| operator docs | https://commoncrawl.org/ccbot |
| last reviewed | 2026-09-14 |

## What blocking it costs you

Future Common Crawl snapshots exclude you, so downstream training sets lose you too — but only going forward. Existing snapshots are permanent and blocking today does not retract them.

## Full user-agent string

```
CCBot/2.0 (https://commoncrawl.org/faq/)
```

## Block it

```
User-agent: CCBot
Disallow: /
```

## Allow it

```
User-agent: CCBot
Allow: /
```

## Ask this page a question, with one GET

A question about this page, answered by a call you can make right now — no key, no account, no JSON-RPC, nothing to assemble. The query string is already filled in with this page's own subject.

- **How do I prove a request really is CCBot?**  
  `curl -s 'https://www.pathwren.workers.dev/tools/verification-methods?crawler=ccbot&s=client-dossiers'`  
  The verification method its operator actually publishes — published IP ranges, reverse DNS, or nothing at all — and the mirror of it on this host.
- **Is 18.97.14.80 really CCBot?**  
  `curl -s 'https://www.pathwren.workers.dev/tools/verify-crawler?ip=18.97.14.80&ua=CCBot&s=client-dossiers'`  
  That address checked against every prefix this host mirrors. 18.97.14.80 is the first address of 18.97.14.80/29, one of the ranges listed on this page — so the link is a worked example that returns a match. Swap in an address from your own log.

Every parameter above is a value the endpoint reads, not an address it visits: nothing is fetched on your behalf. Called without any parameter, each endpoint returns its own specification instead of an error.

JSON: https://www.pathwren.workers.dev/crawler/ccbot.json · index: https://www.pathwren.workers.dev/llms.txt