docs: def is_address_in_network(ip, net):
      """Is an address in a network"""
      # http://stackoverflow.com/questions/819355/how-can-i-check-if-an-ip-is-in-a-network-in-python
      import socket
      import struct
      ipaddr = struct.unpack('=L', socket.inet_aton(ip))[0]
      netaddr, bits = net.split('/')
      if int(bits) == 0:
          return True
      net = struct.unpack('=L', socket.inet_aton(netaddr))[0]
  
      mask = ((2L << int(bits) - 1) - 1)
  
      return (ipaddr & mask) == (net & mask)