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how to get the client's IP? [duplicate]

This question already has answers here:
java InetAddress.getLocalHost(); returns 127.0.0.1 ... how to get REAL IP?
(11 answers)
Closed 7 years ago.
My code always return the loopback ip instead of my IP whick is 192.168..
try {
ip = InetAddress.getLocalHost();
System.out.println("Current IP address : " + ip.getHostAddress());
} catch (UnknownHostException e) {
e.printStackTrace();
}

There are some websites, that their sole piece of data is one line, which includes your public IP address.
Try something like:
URLConnection con = new URL("http://www.myipaddress.com").openConnection();
String ip = new BufferedReader(new
InputStreamReader(con.getInputStream())).readLine();

Android function to return IP address

I'm sending data from android device to localhost database. To do this I need to use my ip address. I can find my ip address by searching 'ipconfig' on the command prompt. I just noticed that my ip address changed slightly even though im using the same wifi connection. The last digit of my ip address changed. This needed a minor change in my code but I was wonder if there was an android function that returned your computers ip address for you so that the code could look like below. Such a function would also help when using other forms of internet connection that would change your ip address.
HttpPost httpPost = new HttpPost("http://" + ipAddressFunction() + "/linker.php");// home wifi

first get your network-interfaces via:
NetworkInterface.getNetworkInterfaces();
then get the IP(s) va:
getInetAddresses()

Here is a function i made to get my Android Device IP.
//Get The Local IP Addresses
private String GetLocalIPAddress(Boolean LoopBack)
{
try
{
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();)
{
NetworkInterface intf = en.nextElement ();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();)
{
InetAddress inetAddress = enumIpAddr.nextElement ();
if(inetAddress.getHostAddress().contains("."))
{
if(inetAddress.isLoopbackAddress() == LoopBack)
{
return inetAddress.getHostAddress();
}
}
}
}
}
catch (Exception e)
{
Log.d(this.getClass().toString(), "Failed Getting Local IP\n\n" + e.getMessage());
}
return null;
}
This function receives a Boolean parameter, if True, it will return the Local Loopback IP (I.E: 127.0.0.1), if False, it will return the normal IP (I.E: 192.168.0.5)

You can try to connect multiple IP, if have the return data is proved to be a computer IP

How to get the IP address for remote host using Java

I need to get the IP address for remote hosts. I tried the following and works fine:
socket = factory.createSocket(hostName, port);
InetAddress remoteIP = socket.getInetAddress();
String[] remoteIPOnly = remoteIP.toString().split("\\/");
System.out.println("Remote IP is: "+remoteIPOnly[1]);
But, I need a way where I don't have to specify a port number. I.e, I need the IP for a remote host despite the port number. Is this possible ? Is it possible to get the IP without creating socket from the first place ?

Try this:
InetAddress inetAddress = InetAddress.getByName("www.google.com");
byte[] raw = inetAddress.getAddress();
The byte array now contains the IP addresses bytes.

Use getHostAddress() as below:
InetAddress inetAddress = InetAddress.getByName("www.google.com");
String ipAddress = inetAddress.getHostAddress();
System.out.println(ipAddress );//prints 66.152.109.61

Creating InetAddress object in Java

I am trying to convert an address specified by an IP number or a name, both in String (i.e. localhost or 127.0.0.1), into an InetAdress object. There's no constructor but rather static methods that return an InetAddress. So if I get a host name it's not a problem, but what if I get the IP number? There's one method that gets byte[] but I'm not sure how that can help me. All other methods gets the host name.
InetAddress API documentation

You should be able to use getByName or getByAddress.
The host name can either be a machine
name, such as "java.sun.com", or a
textual representation of its IP
address
InetAddress addr = InetAddress.getByName("127.0.0.1");
The method that takes a byte array can be used like this:
byte[] ipAddr = new byte[]{127, 0, 0, 1};
InetAddress addr = InetAddress.getByAddress(ipAddr);

From the API for InetAddress
The host name can either be a machine
name, such as "java.sun.com", or a
textual representation of its IP
address. If a literal IP address is
supplied, only the validity of the
address format is checked.

ip = InetAddress.getByAddress(new byte[] {
(byte)192, (byte)168, (byte)0, (byte)102}
);

InetAddress.getByName also works for ip address.
From the JavaDoc
The host name can either be a machine
name, such as "java.sun.com", or a
textual representation of its IP
address. If a literal IP address is
supplied, only the validity of the
address format is checked.

The api is fairly easy to use.
// Lookup the dns, if the ip exists.
if (!ip.isEmpty()) {
InetAddress inetAddress = InetAddress.getByName(ip);
dns = inetAddress.getCanonicalHostName();
}

InetAddress class can be used to store IP addresses in IPv4 as well as IPv6 formats. You can store the IP address to the object using either InetAddress.getByName() or InetAddress.getByAddress() methods.
In the following code snippet, I am using InetAddress.getByName() method to store IPv4 and IPv6 addresses.
InetAddress IPv4 = InetAddress.getByName("127.0.0.1");
InetAddress IPv6 = InetAddress.getByName("2001:db8:3333:4444:5555:6666:1.2.3.4");
You can also use InetAddress.getByAddress() to create object by providing the byte array.
InetAddress addr = InetAddress.getByAddress(new byte[]{127, 0, 0, 1});
Furthermore, you can use InetAddress.getLoopbackAddress() to get the local address and InetAddress.getLocalHost() to get the address registered with the machine name.
InetAddress loopback = InetAddress.getLoopbackAddress(); // output: localhost/127.0.0.1
InetAddress local = InetAddress.getLocalHost(); // output: <machine-name>/<ip address on network>
Note- make sure to surround your code by try/catch because InetAddress methods return java.net.UnknownHostException

This is a project for getting IP address of any website , it's usefull and so easy to make.
import java.net.InetAddress;
import java.net.UnkownHostExceptiin;
public class Main{
public static void main(String[]args){
try{
InetAddress addr = InetAddresd.getByName("www.yahoo.com");
System.out.println(addr.getHostAddress());
}catch(UnknownHostException e){
e.printStrackTrace();
}
}
}

Java to VB.Net Conversion [Small Snippet]

I have this snippet, it's in Java:
final InetAddress address = InetAddress.getLocalHost();
final NetworkInterface ni = NetworkInterface.getByInetAddress(address);
key = new String(ni.getHardwareAddress());
Example of key output: ▲╔UiÎ
What is the equivalent in VB.Net? I understand the first line gets Local Host, what about the rest? Thanks in advance.

This iterates over all local interfaces:
Dim theNetworkInterfaces() as System.Net.NetworkInformation.NetworkInterface = System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()
for each curInterface as System.Net.NetworkInformation.NetworkInterface in theNetworkInterfaces
MessageBox.Show(curInterface.GetPhysicalAddress().ToString())
The physical address is what you want.
The line
final NetworkInterface ni = NetworkInterface.getByInetAddress(address);
just grabs the specific network interface by the inetaddress
Say you store your localhost address in a variable called localIa and then you can use it:
NetworkInterface ni = NetworkInterface.getByInetAddress(localIa)
ni.GetPhysicalAddress().ToString()