China’s Great Firewall is blocking around 311k domains, 41k by accident

In the largest study of its kind, a team of academics from four US and Canadian universities said they were able to determine the size of China’s Great Firewall internet censorship capabilities.

In a research project that lasted nine months, from April to December 2020, academics developed a system called GFWatch that accessed domains from inside and outside China’s internet space and then measured how the Great Firewall (GFW) would tamper with the connection at the DNS level in order to prevent Chinese users from accessing a domain, or an external entity accessing Chinese internal sites.