# Diffbot

> Extracts structured records from pages to build a commercial knowledge graph that is resold and used for retrieval and training.

| field | value |
|---|---|
| operator | Diffbot |
| category | Corpus and dataset builders |
| robots.txt token | `Diffbot` |
| user-agent contains | `Diffbot` |
| robots.txt | obeys robots.txt (documented) |
| verify by | no published verification method |
| published IP ranges | none published |
| prefixes mirrored | 0 IPv4 / 0 IPv6 |
| operator docs | https://docs.diffbot.com/ |
| last reviewed | 2026-09-14 |

## What blocking it costs you

Your facts stop entering a widely-licensed knowledge graph. Whether that is a loss depends on whether you want to be a machine-readable entity.

## Full user-agent string

```
Mozilla/5.0 (compatible; Diffbot/0.1; +http://www.diffbot.com)
```

## Block it

```
User-agent: Diffbot
Disallow: /
```

## Allow it

```
User-agent: Diffbot
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 Diffbot?**  
  `curl -s 'https://www.pathwren.workers.dev/tools/verification-methods?crawler=diffbot&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.

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/diffbot.json · index: https://www.pathwren.workers.dev/llms.txt