Manual:$wgProxyList

Details
Big list of banned IP addresses. (Originally meant for presumed open proxies that would most likely only be used for vandalism and block evasion, but can be used for blocking any kind of unwanted actors.)

Example:

Example
Copy and paste a comma-delimited list (e.g. 1.0.170.183,1.0.170.188,1.0.170.234,1.0.170.24) of open proxies into MediaWiki:Openproxylist; then put the following in :