Java Utililty Methods InetAddress Create

List of utility methods to do InetAddress Create

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Description

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

Method

InetAddressgetConnectionAddress(InetAddress addr)
get Connection Address 
return addr.isAnyLocalAddress() ? InetAddress.getLoopbackAddress() : addr;
InetAddressgetDestinationInetAddress(URI uri)
Get an Internet address for a URI destination, resolving the host name if necessary. 
final String host = uri.getHost();
if (host == null) {
    return null;
final int length = host.length();
if (length == 0) {
    return null;
return InetAddress.getByName(host);
CollectiongetExternalAddresses(InetAddress[] addresses)
Returns a collection of all addresses which do not have a local scope (loopbacks etc). 
ArrayList<InetAddress> result = new ArrayList<InetAddress>();
for (InetAddress addr : addresses) {
    if (addr.isAnyLocalAddress() || addr.isLinkLocalAddress() || addr.isLoopbackAddress())
        continue;
    result.add(addr);
return result;
StringgetFQDN(final InetAddress addr)
get FQDN 
String hostname = addr.getHostName();
if (hostname.indexOf('.') >= 0) {
    return hostname;
hostname = addr.getCanonicalHostName();
if (hostname.indexOf('.') >= 0) {
    return hostname;
String hostAddr = addr.getHostAddress();
try {
    return InetAddress.getByName(hostAddr).getHostName();
} catch (UnknownHostException e) {
    return hostAddr;
intgetFreePort(InetAddress ipAddress)
get Free Port 
int port = getFreeTCPPort(ipAddress);
int retry = 20;
while (retry > 0) {
    if (isUDPPortFree(port, ipAddress)) {
        return port;
    retry -= 1;
return 0;
intgetFreeSocket(InetAddress bindAddress, int portRangeStart, int portRangeEnd)
get Free Socket 
for (int port = portRangeStart; port < portRangeEnd; port++) {
    ServerSocket ssocket = null;
    try {
        ssocket = new ServerSocket();
        ssocket.setReuseAddress(false);
        ssocket.setSoTimeout(10);
        ssocket.bind(new InetSocketAddress(bindAddress, port), 10000);
        return port;
...
intgetFreeTCPPort(InetAddress ipAddress)
get Free TCP Port 
ServerSocket ss = null;
try {
    ss = new ServerSocket(0);
    return ss.getLocalPort();
} catch (IOException iOE) {
} finally {
    if (ss != null) {
        try {
...
StringgetFullHostName(InetAddress netAddress)
get Full Host Name 
if (null == netAddress) {
    return null;
String name = netAddress.getCanonicalHostName(); 
return name;
longgetHashFromAddress(final InetAddress address)
get Hash From Address 
return getHashFromIP(address.getAddress());
StringgetHostAddress(InetAddress address)
Get the host address. 
String host = address.getHostAddress();
if (address instanceof Inet6Address) {
    if (host.indexOf(':') >= 0 && !host.startsWith("[")) {
        host = "[" + host + "]";
return host;