Java Utililty Methods Local Address Get

ArrayList<InetAddress> ips = new ArrayList<>();
try {
    Enumeration<NetworkInterface> netIntf = NetworkInterface.getNetworkInterfaces();
    while (netIntf.hasMoreElements()) {
        Enumeration<InetAddress> addresses = netIntf.nextElement().getInetAddresses();
        while (addresses.hasMoreElements()) {
            InetAddress ip = addresses.nextElement();
            if (ip instanceof Inet4Address && ip.isSiteLocalAddress())
...

Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
while (networkInterfaces.hasMoreElements()) {
    for (InterfaceAddress interfaceAddress : networkInterfaces.nextElement().getInterfaceAddresses()) {
        if (interfaceAddress.getAddress().isSiteLocalAddress()) {
            return interfaceAddress.getAddress().toString().replace("/", "");
throw new IllegalStateException("Expected the computer's local IP address but didn't get one!");

try {
    String hostName = InetAddress.getLocalHost().getHostName();
    InetAddress addrs[] = InetAddress.getAllByName(hostName);
    for (InetAddress addr : addrs) {
        if (!addr.isLoopbackAddress() && addr.isSiteLocalAddress()) {
            return addr.getHostAddress();
    return InetAddress.getLocalHost().getHostAddress();
} catch (Exception e) {
return "Unknown";

try {
    return getNet4Address();
} catch (Exception ex) {
return null;