Capturar mac address

public static String retornaMacAddress() throws SocketException, UnknownHostException {
		InetAddress localHost = InetAddress.getLocalHost();
		NetworkInterface netInter = NetworkInterface
				.getByInetAddress(localHost);
		byte[] macAddressBytes = netInter.getHardwareAddress();

		String macAddress = String.format(
				"%1$02x-%2$02x-%3$02x-%4$02x-%5$02x-%6$02x",
				macAddressBytes[0], macAddressBytes[1], macAddressBytes[2],
				macAddressBytes[3], macAddressBytes[4], macAddressBytes[5])
				.toUpperCase();

		return macAddress;
	}