code: public static boolean isValidCiscoWildcard(InetAddress wildcard)
  	{
  		byte[] segments = wildcard.getAddress();
  
  		for (int i = 0; i < segments.length; i++)
  		{
  			assert (((byte) ~(byte) ~segments[i]) == segments[i]);
  			segments[i] = (byte) ~segments[i];
  		}
  
  		return isValidNetmask(segments);
  	}
docs: Determines if a specified address is a valid Cisco Wildcard (cisco's representation of a netmask)
  
  @param wildcard
  InetAddress
  
  @return boolean