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GreatFire

GreatFire measures censorship by the Great Firewall of China. For any website or URL it reports whether it is blocked in mainland China, since when, by what mechanism (DNS poisoning, connection reset, redirection to a Chinese site), and the underlying US/CN test data.

For agents: GreatFire reports whether any website is blocked in mainland China, the blocking mechanism and dates, plus underlying US/CN test data.

great firewallinternet censorshipchina blockingwebsite accessibilitycensorship measurement

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T15:16:21.907Z. Cached copy · Source on greatfire.org

# GreatFire

> GreatFire measures censorship by the Great Firewall of China. For any website or URL it reports whether it is blocked in mainland China, since when, by what mechanism (DNS poisoning, connection reset, redirection to a Chinese site), and the underlying US/CN test data.

## Check a URL
- Verdict page: https://en.greatfire.org/https/<host><path> — e.g. https://en.greatfire.org/https/facebook.com
- JSON verdict for any page: put /api/url/ in front of its path — e.g. https://en.greatfire.org/api/url/https/facebook.com
- A verdict is one of: blocked, redirected (to a Chinese site), intermittent, not blocked, or not enough data. The headline percentage is the share of conclusive tests blocked over the last 90 days.

## API (JSON)
- https://en.greatfire.org/api/verdict?path=https/facebook.com — verdict + 90-day stats + per-test history
- https://en.greatfire.org/api/search?q=facebook — ranked search + related URLs
- https://en.greatfire.org/api/domain?registrable=facebook.com — every tested host under a domain
- https://en.greatfire.org/api/test?id=<id> — the raw US/CN measurement rows for one test

## Key pages
- https://en.greatfire.org/analyzer — home / search
- https://en.greatfire.org/blocked — currently and notably blocked sites
- https://en.greatfire.org/explore — browse every tested URL by interference mechanism or status
- https://en.greatfire.org/trends — site-wide statistics and blocked-by-TLD breakdown
- https://en.greatfire.org/top-sites-china — the 1,000 most-visited websites (Tranco) and whether each is reachable from mainland China
- https://en.greatfire.org/data — dataset description and full endpoint list
- https://en.greatfire.org/data/methodology — how the tests and verdicts work, and their limits
- https://en.greatfire.org/faq — how this site tests, what its verdicts mean, what they cannot tell you
- https://en.greatfire.org/vpns-proxies — looking up circumvention tools' own websites; tool rankings live at https://cc.greatfire.org

## Methodology
Each URL is fetched from control (US) and in-country (CN) vantage points. Rows are compared to decide the mechanism: DNS poisoning (CN resolves to a poisoned/mismatched IP), connection reset (CN connection fails while US succeeds), redirection to a Chinese site, or an empty/blocked response. Each detector is gated on the evidence it needs: if the control's own transfer fails, the DNS, reset and redirect checks still apply, but such a test can only convict, never clear a URL. Full detail: https://en.greatfire.org/data/methodology

## About
GreatFire has monitored the Great Firewall since 2011. To bypass it, see GreatFireVPN: https://greatfirevpn.com

Related sites

Other listed sites in Cybersecurity. See the whole category →

Machine-readable: GET /v1/resolve?q=greatfire.org · GET /v1/domain/greatfire.org · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for greatfire.org:
1. POST https://agentwebmap.com/v1/sites/greatfire.org/claims and keep claim_id and claim_secret private.
2. Publish the proof: add the line "AgentWebMap ownership: <token>" (token from step 1) to https://greatfire.org/llms.txt, or use the DNS, meta-tag or well-known method the response describes.
3. POST https://agentwebmap.com/v1/sites/greatfire.org/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/greatfire.org).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

Corrections or removal requests: contact the directory.