Java Utililty Methods Network Interface Get

List of utility methods to do Network Interface Get

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Description

The list of methods to do Network Interface Get are organized into topic(s).

Method

voidenumerateInterfaces()
We must use -Djava.net.preferIPv4Stack=true to get expected results for broadcast address and prefix length. 
final Enumeration<NetworkInterface> interfaces;
for (interfaces = NetworkInterface.getNetworkInterfaces(); interfaces.hasMoreElements();) {
    final NetworkInterface networkInterface;
    networkInterface = interfaces.nextElement();
    if ((networkInterface.isUp()) && (!networkInterface.isVirtual())) {
        reportInterface(networkInterface, "");
ListgetAllAvailableInterfaces()
get All Available Interfaces 
List<NetworkInterface> retval = new ArrayList<NetworkInterface>(10);
NetworkInterface intf;
for (Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
    intf = (NetworkInterface) en.nextElement();
    retval.add(intf);
return retval;
ListgetAllAvailableInterfaces()
Returns all the available interfaces, including first level sub interfaces. 
List<NetworkInterface> allInterfaces = new ArrayList<>();
for (Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces(); interfaces
        .hasMoreElements();) {
    NetworkInterface intf = interfaces.nextElement();
    allInterfaces.add(intf);
    Enumeration<NetworkInterface> subInterfaces = intf.getSubInterfaces();
    if (subInterfaces != null && subInterfaces.hasMoreElements()) {
        while (subInterfaces.hasMoreElements()) {
...
ListgetAllAvailableInterfaces()
get All Available Interfaces 
List<NetworkInterface> allInterfaces = new ArrayList<>();
for (Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces(); interfaces
        .hasMoreElements();) {
    NetworkInterface networkInterface = interfaces.nextElement();
    allInterfaces.add(networkInterface);
    Enumeration<NetworkInterface> subInterfaces = networkInterface.getSubInterfaces();
    if (subInterfaces.hasMoreElements()) {
        while (subInterfaces.hasMoreElements()) {
...
SetgetAllInterfaces()
Get all the host interfaces including the loopback one 
Set<NetworkInterface> result = new HashSet<NetworkInterface>();
try {
    Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces();
    while (e.hasMoreElements()) {
        result.add(e.nextElement());
} catch (SocketException e) {
return result;
ListgetAllInterfaces()
Get all interfaces, including virtual interfaces. 
List<NetworkInterface> allInterfaces = Collections.list(NetworkInterface.getNetworkInterfaces()).stream()
        .flatMap(m -> {
            List<NetworkInterface> l = Collections.list(m.getSubInterfaces());
            l.add(m);
            return l.stream();
        }).collect(Collectors.toList());
return allInterfaces;
SetgetAllLocalInterfaces()
Get all the interfaces which are not loopback ones 
Set<NetworkInterface> result = new HashSet<NetworkInterface>();
try {
    Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces();
    while (e.hasMoreElements()) {
        NetworkInterface ni = e.nextElement();
        Enumeration<InetAddress> set = ni.getInetAddresses();
        if (set.hasMoreElements()) {
            InetAddress address = set.nextElement();
...
InetAddress[]getAllLocalUsingNetworkInterface()
Utility method that delegates to the methods of NetworkInterface to determine addresses for this machine. 
try {
    List<InetAddress> addresses = new ArrayList<InetAddress>();
    Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces();
    while (e.hasMoreElements()) {
        NetworkInterface ni = e.nextElement();
        for (Enumeration<InetAddress> e2 = ni.getInetAddresses(); e2.hasMoreElements();) {
            addresses.add(e2.nextElement());
    return addresses.toArray(new InetAddress[] {});
} catch (SocketException ex) {
    throw new UnknownHostException("127.0.0.1");
NetworkInterfacegetAvailableNetworkInterface()
get Available Network Interface 
try {
    Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
    while (networkInterfaces.hasMoreElements()) {
        NetworkInterface networkInterface = networkInterfaces.nextElement();
        if (networkInterface.isLoopback())
            continue;
        if (networkInterface.isUp())
            return networkInterface;
...
StringgetBroadcast()
get Broadcast 
System.setProperty("java.net.preferIPv4Stack", "true");
for (Enumeration<NetworkInterface> niEnum = NetworkInterface.getNetworkInterfaces(); niEnum
        .hasMoreElements();) {
    NetworkInterface ni = niEnum.nextElement();
    if (!ni.isLoopback()) {
        for (InterfaceAddress interfaceAddress : ni.getInterfaceAddresses()) {
            InetAddress bcast = interfaceAddress.getBroadcast();
            if (bcast != null) {
...