ConnectivityManager cmWifi = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cmWifi.getActiveNetworkInfo();
WifiManager wm = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);


WifiInfo connectionInfo = wm.getConnectionInfo();
int ipAddress = connectionInfo.getIpAddress();
String ipString = Formatter.formatIpAddress(ipAddress);


Log.d(TAG, "activeNetwork: " + String.valueOf(activeNetwork));
Log.d(TAG, "ipString: " + String.valueOf(ipString));

String prefix = ipString.substring(0, ipString.lastIndexOf(".") + 1);
Log.d(TAG, "prefix: " + prefix);

for (int i = 0; i < 255; i++) {
// String testIp = prefix + String.valueOf(38);
String testIp = prefix + String.valueOf(i);
InetAddress address = InetAddress.getByName(testIp);
boolean reachable = address.isReachable(1000);
String hostName = address.getCanonicalHostName();

if (reachable)
Log.i(TAG, "Host: " + String.valueOf(hostName) + "(" + String.valueOf(testIp) + ") is reachable!");

}

ConnectivityManager cmWired = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

Log.i(TAG, "End search ");