code: private boolean setRangeMask(String ipString, String maskBitsString) {
  		byte[] tmpMask = maskBits(maskBitsString);
  		if(tmpMask != null) {
  			if(setRangeIP(ipString)) {
  				mask = tmpMask;
  				ip = and(ip,mask);
  				return true;
  			}
  		}
  		return false;
  	}
docs: PRIVATE INSTANCE METHODS: