Within my firewall software, I can not set a specific span (##.##.##.2-30) instead I have to use IP/Netmask, so, if I am allowing an entire 1-255 group it is pretty easy...
##.##.122.0/24
but, what do I put if I only want to allow 2-30 (I am hoping someone can save me the 'binary' math..)
##.##.122.0/?????
Thanks..