# 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]