Manual:$wgSoftBlockRanges

Access: $wgSoftBlockRanges
IP ranges that should be considered soft-blocked (anon-only, account creation allowed)
Introduced in version:1.29.0 (Gerrit change 324214; git #337c0fb3)
Removed in version:Still in use
Allowed values:(array of IP ranges)
Default value:[]

Details

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IP ranges that should be considered soft-blocked (anon-only, account creation allowed). The intent is to use this to prevent anonymous edits from shared resources such as Wikimedia Cloud VPS.