Java Utililty Methods InetAddress Check

List of utility methods to do InetAddress Check

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Description

The list of methods to do InetAddress Check are organized into topic(s).

Method

booleanisLocalAddress(InetAddress address)
Cheke whether the given address is local address or not. 
if (address == null) {
    return false;
try {
    Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
    while (interfaces.hasMoreElements()) {
        NetworkInterface networkInterface = interfaces.nextElement();
        Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
...
booleanisLocalIP(final InetAddress ip1, final InetAddress ip2, final int mask)
is Local IP 
byte[] x = ip1.getAddress();
byte[] y = ip2.getAddress();
if (x == y) {
    return true;
if (x == null || y == null) {
    return false;
if (x.length != y.length) {
    return false;
final int bits = mask & 7;
final int bytes = mask >>> 3;
for (int i = 0; i < bytes; i++) {
    if (x[i] != y[i]) {
        return false;
final int shift = 8 - bits;
return !(bits != 0 && x[bytes] >>> shift != y[bytes] >>> shift);
booleanisLocalIpAddress(final InetAddress ipAddress)
is Local Ip Address 
return ipAddress.isSiteLocalAddress() && !ipAddress.isLoopbackAddress() && !isV6IpAddress(ipAddress);
booleanisLoopbackAddress(InetAddress address)
is Loopback Address 
return isLoopbackAddress(address.getAddress());
booleanisLoopbackIp(InetAddress addr)
See if given address is loopback or not 
boolean result = false;
if (addr instanceof Inet4Address) {
    result = isLoopbackIp((Inet4Address) addr);
} else if (addr instanceof Inet6Address) {
    result = isLoopbackIp((Inet6Address) addr);
return result;
booleanisMulticastAddress(InetAddress ipAddr)
is Multicast Address 
int firstOctet = ipAddr.getAddress()[0];
if (firstOctet < 0) {
    firstOctet += 255;
return ((firstOctet >= 224) && (firstOctet < 240));
booleanisOnNetwork(InetAddress host, InetAddress network, byte[] mask)
Given an InetAddress instance that specifies a network mask and an InetAddress instance for a specific host figure out whether the host is included in the network mask. 
boolean result = true;
byte[] hostAddr = host.getAddress();
byte[] networkAddr = network.getAddress();
for (int i = 0; i < networkAddr.length; i++) {
    if ((hostAddr[i] & mask[i]) != networkAddr[i]) {
        result = false;
        break;
return result;
booleanisPortFree(int port, InetAddress addr)
is Port Free 
return isTCPPortFree(port, addr) && isUDPPortFree(port, addr);
booleanisPortInUse(InetAddress address, int port, int count)
Checks to see if the given local port number is being used. 
boolean inUse = isPortInUse(address, port);
while (inUse && count > 0) {
    try {
        Thread.sleep(500);
    } catch (Exception e) {
    inUse = isPortInUse(address, port);
    count--;
...
booleanisPortOpen(InetAddress address, int port)
is Port Open 
Socket socket = null;
try {
    socket = new Socket();
    socket.connect(new InetSocketAddress(address, port), 1000);
    return true;
} catch (IOException e) {
    return false;
} finally {
...