htaccess question

[DoctorGeo2008]

I'm trying to ban a specific group of IP addresses. Here's the line I have in my htaccess file but is doesn't seem to be working.

deny from 209.120.128.0 - 209.120.255.255


Other stuff like:

deny from 200 works fine but not the above. Can anyone help?

Thanks,

Geoff

[primesuspect]

try 209.120.128.1 to 209.120.255.254

.0 and .255 are reserved.