Part of cvut.czMixed6 tested URLs
Can you open http://kos.is.cvut.cz from mainland China?
N/A.
This domain doesn't resolve anywhere we test — including our control outside mainland China — so it appears inactive or unregistered rather than blocked.
2018first tested
4 mo agolast tested
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Frequently asked questions
Is http://kos.is.cvut.cz blocked in mainland China right now?
As of the last test on 2026-04-26, http://kos.is.cvut.cz is not resolvable from anywhere we test in mainland China, based on GreatFire's live Great Firewall measurements.
http://kos.is.cvut.cz · JSON