Java Utililty Methods Host Check

boolean checkHost(String host)
check Host

try {
 InetAddress.getByName(host);
 return (true);
} catch (UnknownHostException uhe) {
 return (false);

void checkHost(String hostname)
check Host

InetAddress.getByName(hostname);

InetAddress checkHostIsAvailable(String hostName)
check Host Is Available

try {
 InetAddress hostAddr = InetAddress.getByName(hostName.trim());
 return hostAddr;
} catch (UnknownHostException e) {
 System.out.println("Unknow host error for host " + hostName + ": " + e);
 return null;

boolean checkHostName(String hostName)
Check if the host name is the given one.

if (hostName == null) {
 System.err.println("Given HOST name was NULL");
 return false;
try {
 String localHost = InetAddress.getLocalHost().getHostName();
 Pattern regex = Pattern.compile(hostName, Pattern.CASE_INSENSITIVE);
 Matcher regexMatcher = regex.matcher(localHost);
...

boolean isLocal(final String hostname)
is Local

try {
 return InetAddress.getByName(hostname).isLoopbackAddress();
} catch (UnknownHostException e) {
 return false;

boolean isLocal(final String hostName)
Checks if given host name is local.

try {
 return isLocal(InetAddress.getByName(hostName));
} catch (final UnknownHostException e) {
 return false;

boolean isHostReachable(String host, int timeout)
Get a value indicating whether the specified host is reachable using the specified timeout.

try {
 return InetAddress.getByName(host).isReachable(timeout);
} catch (IOException e) {
 return false;

boolean isInternalHostname(String host)
Checks if a host name is internal

try {
 InetAddress addr = InetAddress.getByName(host);
 return addr.isSiteLocalAddress() || addr.isLoopbackAddress();
} catch (UnknownHostException e) {
 e.printStackTrace();
return false;

boolean isThisMe(String hostname)
is This Me

try {
 InetAddress[] myadds = getHostAddresses();
 InetAddress[] theiradds = InetAddress.getAllByName(hostname);
 for (int i = 0; i < theiradds.length; i++) {
 if (theiradds[i].isLoopbackAddress()) {
 return true;
 for (int j = 0; j < myadds.length; j++) {
...

String normalizeHost(String host)
normalize Host

try {
 InetAddress address = InetAddress.getByName(host);
 if (isLocalAddress(address)) {
 return InetAddress.getLocalHost().getHostAddress();
 } else {
 return address.getHostAddress();
} catch (UnknownHostException e) {
...