// Arrange & Act
        boolean result = UniAddress.isDotQuadIP(ip);
        // Assert
        assertTrue(result, "isDotQuadIP should return true for dot-quad IP");
    }

    @ParameterizedTest
    @ValueSource(strings = { "192.168.0", "abcd", "192.168" })
    void isDotQuadIPRejectsNonDotQuad(String value) {
        assertFalse(UniAddress.isDotQuadIP(value), "isDotQuadIP should return false for non IP-like values");
    }

            assertFalse(UniAddress.isDotQuadIP(input));
        }

        @Test
        void shouldReturnTrueForInvalidOctetValues() {
            // isDotQuadIP does not validate octet values, only checks format
            assertTrue(UniAddress.isDotQuadIP("192.168.1.256"));
            assertTrue(UniAddress.isDotQuadIP("999.999.999.999"));
        }

        @Test

    /**
     * Check whether a hostname is actually an ip address
     *
     * @param hostname the hostname to check
     * @return whether this is an IP address
     */
    public static boolean isDotQuadIP(final String hostname) {
        if (Character.isDigit(hostname.charAt(0))) {
            int i, len, dots;
            char[] data;

            i = dots = 0; /* quick IP address validation */

     */
    public static UniAddress getByName(final String hostname) throws UnknownHostException {
        return getByName(hostname, false);
    }

    static boolean isDotQuadIP(final String hostname) {
        if (hostname != null && hostname.length() > 0 && Character.isDigit(hostname.charAt(0))) {
            int i, len, dots;
            char[] data;

        if (hostname == null || hostname.length() == 0) {
            throw new UnknownHostException();
        }

        if (UniAddress.isDotQuadIP(hostname)) {
            return new UniAddress[] { new UniAddress(getNbtByName(hostname)) };
        }

        if (log.isTraceEnabled()) {