Extension:BulkBlock

The BulkBlock MediaWiki extension allows administrators to easily block multiple users at once on a MediaWiki website.

Installation
Or install via Git:

Usage

 * Navigate to the Special:BulkBlock page on your MediaWiki website.
 * Enter the usernames of the users you wish to block in the text box.
 * Enter the reason for the block in the text box.
 * Press the "Block" button.