actually handle the basic subnet math

import netblocks as nb b = nb.Block("10.24.20.0/9") b.network 167772160L b.netmask 4286578688L b.broadcast 176160767L for pack in [b.network,b.netmask,b.broadcast]: ... print nb.pack2str(pack) ... 10.0.0.0 255.128.0.0 10.127.255.255

determine what netblocks span a start/end range of IP addresses

start = nb.Block("216.240.32.0/32") end = nb.Block("216.240.32.255/32") nb.range2cidr(start,end) [216.240.32.0/24] end = nb.Block("216.241.32.255/32") nb.range2cidr(start,end) [216.240.32.0/19, 216.240.64.0/18, 216.240.128.0/17, 216.241.0.0/19, 216.241.32.0/24]