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Free tool · China & network

China-readiness scanner

Enter a page address to list the third-party resources that may be unreachable from mainland China, with a score and a fix list.

Request a route assessment

How this works and its limits

The scanner fetches the page from our server, lists the external hosts it loads fonts, scripts, video and other resources from, and compares them with a curated list of 23 services that are often unreachable or slow in mainland China. The list is reviewed quarterly, and each entry cites a GreatFire Analyzer verdict read on a stated date.

It reads the page as published and does not test from inside China. A GreatFire verdict covers one URL at a date, not a whole service, so treat the result as a planning aid. Fixes are split into those that need a different delivery path and those that need different content.

Data sources and licences

Operator names, brands and codes shown here are public reference data compiled from national regulators and other public sources. Their appearance does not indicate any partnership, endorsement, agreement or connectivity between unicomam.com and the named operators. All trademarks belong to their owners. Data is provided “as is” with no warranty; verify against the official source before relying on it for routing, billing or compliance decisions.

Regulatory information is for reference only and is not legal advice; check the regulator link and the “last verified” date.

Source: GreatFire.org Analyzer (opens in a new tab). Each verdict shows the address tested, the date and the time window it covers; summarised by unicomam.com. GreatFire does not endorse unicomam.com.

Why some websites load poorly in mainland China

A page is only as fast as its slowest dependency. Many sites load fonts, maps, video players, analytics or bot checks from global services that may be unreachable or very slow in mainland China, and a single stalled script can hold up the whole page.

Fixing this usually takes two kinds of change. Some resources can be served over a better delivery path or from hosts that work well in China; others, such as embedded services that are not offered there, need to be replaced or removed for visitors in China.

A scan shows where to start. For sites with users in China, test from inside the country before and after the changes.

Frequently asked questions

Does the scanner test from inside China?
No. It reads the page and checks its resources against a curated list reviewed quarterly. It does not measure reachability from inside the country.

What does a GreatFire verdict mean?
GreatFire tests one exact URL and reports a verdict for a window ending on a stated date. It is evidence for that URL at that time, not a live test and not a claim about every host or path under a service.

What should I do about a resource on the list?
Replace it with an equivalent that works in China, self-host or bundle it, or load it only for visitors outside China. The fix list says which applies.