import java.net.InetAddress;
import java.net.UnknownHostException;
public class DNSLookup {
public static void main(String args[]) {
try {
InetAddress host;
if (args.length == 0) {
host = InetAddress.getLocalHost();
} else {
host = InetAddress.getByName(args[0]);
}
System.out.println("Host:'" + host.getHostName()
+ "' has address: " + host.getHostAddress());
byte bytes[] = host.getAddress();
int fourBytes[] = new int[bytes.length];
for (int i = 0, n = bytes.length; i < n; i++) {
fourBytes[i] = bytes[i] & 255;
}
System.out.println("\t" + fourBytes[0] + "." + fourBytes[1] + "."
+ fourBytes[2] + "." + fourBytes[3]);
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
}