import java.io.*; 
import java.net.*; 
public class WhoAmI 
{ 
/** 
* Tells you the domain name and IP of the machine 
* you are running. 
* 
* @param args not used. 
*/ 
public static void main (String[] args) 
{ 
try 
{ 
InetAddress localaddr = InetAddress.getLocalHost () ; 
System.out.println ( "main Local IP Address : " + localaddr.getHostAddress () ); 
System.out.println ( "main Local hostname   : " + localaddr.getHostName () ); 
System.out.println () ; 

InetAddress[] localaddrs = InetAddress.getAllByName ( "localhost" ) ; 
for ( int i=0 ; i<localaddrs.length ; i++ ) 
{ 
if ( ! localaddrs[ i ].equals( localaddr ) ) 
{ 
System.out.println ( "alt  Local IP Address : " + localaddrs[ i].getHostAddress () ); 
System.out.println ( "alt  Local hostname   : " + localaddrs[ i].getHostName () ); 
System.out.println () ; 
} 
} 
} 

catch ( UnknownHostException e ) 
{ 
System.err.println ( "Can't detect localhost : " + e) ; 
} 
} 
}