dest_ip in cache.config should be expand to network style

Hi,
I'm tring to exclude a /22 netblock from the cache system but the syntax "dest_ip" doesn't work, detalis below:

dest_ip="x.y.84.0-x.y.87.255" action=never-cache

I've tried to "stop,clear-cache,start" several times but every time images have been put into the cache and log shows "NONE FIN FIN TCP_MEM_HIT" or "NONE FIN FIN TCP_IMS_HIT".

Other Info:

proxy.node.version.manager.long=Apache Traffic Server - traffic_manager - 5.1.0 - (build # 81013 on Sep 10 2014 at 13:13:42)