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I need to determine if the Android device is connected to Wifi, and if so, obtain its Wifi IP address.

I know how to use ConnectivityManager to determine whether the active network is a Wifi network, and I know how to use java.net.NetworkInterface to iterate over the available network interfaces and get their IP addresses.

What I don't know how to do is determine which IP address belongs to the Wifi network, if there is more than one address found. Any advice?


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3 Answers 3

up vote 40 down vote accepted
public String getIpAddr() {
   WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
   WifiInfo wifiInfo = wifiManager.getConnectionInfo();
   int ip = wifiInfo.getIpAddress();

   String ipString = String.format(
   (ip & 0xff),
   (ip >> 8 & 0xff),
   (ip >> 16 & 0xff),
   (ip >> 24 & 0xff));

   return ipString;

Please Note: You need to add android.permission.INTERNET and android.permission.ACCESS_WIFI_STATE in your AndroidManifest.xml as <user-permission/> to access the code.

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
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This seems to work, thanks for the info. –  Frank LaRosa Nov 2 '11 at 12:00
Glad that it worked!!! –  Tanmay Mandal Nov 2 '11 at 12:14
the INTERNET permission is not needed; just the ACCESS_WIFI_STATE (at least on 4.1.1) –  Richard Le Mesurier Jan 17 '13 at 9:33
Awesome!!! This was the only code which worked for getting the local Wifi-LAN IP of my smartphone. I really searched hours. –  Gerhard Hagerer Apr 19 '13 at 9:23
You can use Formatter.formatIpAddress instead of doing the formatting by hand. –  pwnall May 1 '13 at 3:40

Please try this code.

ConnectivityManager connec = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

//To fetch the state of the Wi-Fi network in the device
Boolean isWifi = connec.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting(); 

WifiManager wifiMgr = (WifiManager) getBaseContext().getSystemService(Context.WIFI_SERVICE); 
WifiInfo wifiInfo = wifiMgr.getConnectionInfo(); 

//To fetch the name of the Wi-Fi network to which the device is connected
String wifiName = wifiInfo.getSSID(); 
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This is useful in that it gives me the name of the Wifi network, but that's not really what I was looking for. When I enumerate the network interfaces, they have names such as "tiwlan0". I need to associate that name with the active network. –  Frank LaRosa Nov 2 '11 at 11:57
static final int IP_ADDRESS_LENGTH = 32;

  public static Integer getSystemWifiIpAddress(Context context)
    WifiManager wManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    WifiInfo wInfo = wManager.getConnectionInfo();

    int ipAddress = wInfo.getIpAddress();
    if (ipAddress == 0)
      return null;
    return ipAddress;
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How can an IP be an int? –  Mark Buikema Jul 12 '14 at 14:55

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