public static String getEndIpStr(String ip, int maskBit) {
		return longToIpv4(getEndIpLong(ip, maskBit));
	}
@Test
	public void getEndIpStrTest(){
		final String ip = "192.168.1.1";
		final int maskBitByMask = Ipv4Util.getMaskBitByMask("255.255.255.0");
		final String endIpStr = Ipv4Util.getEndIpStr(ip, maskBitByMask);
		assertEquals("192.168.1.255", endIpStr);
	}