question: public static List < InetAddress > hostAddresses ( ) { List < InetAddress > addrList = new ArrayList < > ( ) ; Enumeration < NetworkInterface > IFCs = null ; try { IFCs = NetworkInterface . getNetworkInterfaces ( ) ; } catch ( SocketException ex ) { log . error ( "Unable to get network interfaces." , ex ) ; } if ( IFCs != null ) { while ( IFCs . hasMoreElements ( ) ) { NetworkInterface IFC = IFCs . nextElement ( ) ; try { if ( IFC . isUp ( ) ) { Enumeration < InetAddress > addresses = IFC . getInetAddresses ( ) ; while ( addresses . hasMoreElements ( ) ) { InetAddress address = addresses . nextElement ( ) ; if ( ! address . isLoopbackAddress ( ) && ! address . isLinkLocalAddress ( ) ) { addrList . add ( address ) ; } } } } catch ( SocketException ex ) { log . error ( "Unable to read network interface {}." , IFC . toString ( ) , ex ) ; } } } return addrList ; }
target:  A list of the non-loopback, non-link-local IP addresses of the host, or null if none found.