polyfill.io

All clear

The one URL under polyfill.io we have a verdict for is not blocked in mainland China. The site itself, http://polyfill.io, loads normally. 55 tests have been run under this domain since 2018-10-08, the most recent on 2026-07-20.

3URLs tested

1accessible

55tests all-time

2018first tested

1 mo agolast tested

The site itself

http://polyfill.ioNot blocked

Pages and subdomains (2)

http://cdn.polyfill.ioUnresolvable https://cdn.polyfill.ioUnresolvable

About polyfill.io and the Great Firewall

Is polyfill.io blocked in mainland China?

The one URL under polyfill.io we have a verdict for is not blocked in mainland China. The site itself, http://polyfill.io, loads normally. 55 tests have been run under this domain since 2018-10-08, the most recent on 2026-07-20.

Elsewhere on the site

Most-blocked .io domains Every tested URL under polyfill.io

Each URL's status is its verdict over the last 90 days, the same one its own page headlines.