From WikiIslam

WikiIslam has some automatic features that block potential vandalism automatically. See Auto Block for more information. If you have spotted vandalism, you can also notify sysops who can block the vandal.

[edit] Administrator notes

For blocking IP ranges of the format 123.456.X.X, use this as the block text: 123.456.0.0/16 You can also use this IP Block Range Calculator for calculating the range.