Java Utililty Methods InetAddress Check

List of utility methods to do InetAddress Check

  1. HOME
  2. Java
  3. I
  4. InetAddress Check

Description

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

Method

booleanisThisMyIpAddress(InetAddress addr)
is This My Ip Address 
if (addr.isAnyLocalAddress() || addr.isLoopbackAddress())
    return true;
try {
    return NetworkInterface.getByInetAddress(addr) != null;
} catch (SocketException e) {
    return false;
booleanisUDPPortFree(int port, InetAddress addr)
is UDP Port Free 
DatagramSocket ds = null;
try {
    ds = new DatagramSocket(port, addr);
    return true;
} catch (IOException io) {
} finally {
    if (ds != null) {
        ds.close();
...
booleanisUnicastAddress(@CheckForNull InetAddress address)
Determines whether the given address is a "useful" unicast address. 
return (address != null) && !address.isAnyLocalAddress() && !address.isLoopbackAddress()
        && !address.isMulticastAddress();
booleanisValidAddress(InetAddress address, int timeoutMs)
Tests if the address is externally resolvable. 
return !address.isAnyLocalAddress() && !address.isLinkLocalAddress() && !address.isLoopbackAddress()
        && address.isReachable(timeoutMs) && (address instanceof Inet4Address);
booleanisValidAddress(InetAddress i, boolean includeLocalAddressesInNoderefs)
is Valid Address 
if (i.isAnyLocalAddress()) {
    return false;
} else if (i.isLinkLocalAddress() || i.isLoopbackAddress() || i.isSiteLocalAddress()) {
    if (includeLocalAddressesInNoderefs) {
        return true;
    } else
        return false;
} else if (i.isMulticastAddress()) {
...
booleanisValidAddress(InetAddress i, boolean includeLocalAddressesInNoderefs)
is Valid Address 
if (i.isAnyLocalAddress()) {
    return false;
} else if (i.isLinkLocalAddress() || i.isLoopbackAddress() || isSiteLocalAddress(i)) {
    if (includeLocalAddressesInNoderefs) {
        return true;
    } else
        return false;
} else if (i.isMulticastAddress()) {
...
booleanisValidCiscoWildcard(InetAddress wildcard)
Determines if a specified address is a valid Cisco Wildcard (cisco's representation of a netmask) 
byte[] segments = wildcard.getAddress();
for (int i = 0; i < segments.length; i++) {
    assert (((byte) ~(byte) ~segments[i]) == segments[i]);
    segments[i] = (byte) ~segments[i];
return isValidNetmask(segments);
booleanisValidInetAddress(String address)
is Valid Inet Address 
try {
    InetAddress.getByName(address);
    return true;
} catch (UnknownHostException e) {
    return false;
voidisValidInetAddress(String ip)
is Valid Inet Address 
if (ip != null && !ip.isEmpty()) {
    if (!ip.contains(":")) {
        String[] segments = ip.split("\\.");
        if (segments.length != 4) {
            throw new IllegalArgumentException("IP does not appear valid:" + ip);
        try {
            InetAddress.getByName(ip);
...
voidisValidInetAddress(String IP)
Verify if IP string is an IPv4 address. 
if (IP == null || IP.isEmpty()) {
    throw new IllegalArgumentException("IP is missing or empty");
if (IP.contains(":")) {
} else {
    String[] segments = IP.split("\\.");
    if (segments.length != 4) {
        throw new IllegalArgumentException("IP does not appear valid:" + IP);
...