Wikipedia:Open proxies
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Users using open or anonymous proxies are not allowed to edit Wikipedia. Wikipedia encourages anyone in the world to edit, regardless of whether or not they create a user account. However, to deal with vandalism, and to ensure that contributions are properly attributed to their author, editing via such proxies is not allowed. No restrictions are placed on reading Wikipedia, of course.
Any IP address which is an open proxy may be indefinitely blocked by any administrator at any time. Once "closed", the IP address should be unblocked. Wikipedia administrators frequently check IP addresses from which vandalism originates, to see if they might be proxies. There is also a Wikipedia project, Wikipedia:WikiProject on open proxies, to identify and block open proxy servers.
If you have been blocked as an open proxy, please see Help:blocked. Proxies are often "opened" by hackers, or due to being incorrectly configured.
This policy is known to cause hardship to some Wikipedia readers, who must use open proxies to circumvent censorship where they live; a well-known example is the government of the People's Republic of China, which attempts to prevent its citizens from reading or editing Wikipedia. Chinese readers who wish to edit Wikipedia should read Wikipedia:Advice to Tor users in China