code: def get_net_size(mask):
      '''
      Turns an IPv4 netmask into it's corresponding prefix length
      (255.255.255.0 -> 24 as in 192.168.1.10/24).
      '''
      binary_str = ''
      for octet in mask.split('.'):
          binary_str += bin(int(octet))[2:].zfill(8)
      return len(binary_str.rstrip('0')f get_net_size(mask):
      '''
      Turns an IPv4 netmask into it's corresponding prefix length
      (255.255.255.0 -> 24 as in 192.168.1.10/24).
      '''
      binary_str = ''
      for octet in mask.split('.'):
          binary_str += bin(int(octet))[2:].zfill(8)
      return len(binary_str.rstrip('0'))
docs: Turns an IPv4 netmask into it's corresponding prefix length
      (255.255.255.0 -> 24 as in 192.168.1.10/24).