Board Thread:Support Requests - Community Management/@comment-4957813-20140707034838/@comment-4143277-20140714185115

On the block URL (for example /wiki/Special:Block/123.456.789) add a /16 to the end of the block URL, so here it would be /wiki/Special:Block/123.456.789/16. The software will automatically calculate that range, and you can block it.