@Test
public void testIpv4() throws UnknownHostException {

    CIDRUtils cidrUtils = new CIDRUtils("192.168.1.0/26");
    Assertions.assertTrue(cidrUtils.isInRange("192.168.1.63"));
    Assertions.assertFalse(cidrUtils.isInRange("192.168.1.65"));
    cidrUtils = new CIDRUtils("192.168.1.192/26");
    Assertions.assertTrue(cidrUtils.isInRange("192.168.1.199"));
    Assertions.assertFalse(cidrUtils.isInRange("192.168.1.190"));
}