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Java Program to Get System IP Address in Windows and Linux Machine

  • Difficulty Level : Medium
  • Last Updated : 07 Jan, 2021

IP Address: An Internet Protocol address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. 

Packages used:

  1. io (input-output): This package provides for system input and output through data streams, serialization, and the file system.
  2. net (network): This package provides the classes for implementing networking applications.
  3. util (utility): It contains the collection framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes

Methods Used:

1. getInetAddresses()


public Enumeration getInetAddresses()

Return Type: It returns an Enumeration of InetAddress.

2. getInterfaceAddresses()


public List getInterfaceAddresses()

Return Type: It returns a list of instances.

Below is the implementation of the problem statement:


// Java Program to Get System IP Address
// in Windows and Linux Machine
import static java.lang.System.out;
import java.util.*;
public class gfg {
    public static void main(String args[]) // main method
        throws SocketException
        // fetching network interface
        Enumeration<NetworkInterface> nets
            = NetworkInterface.getNetworkInterfaces();
        for (NetworkInterface netint :
    // Display Internet Informaton method
    static void
    displayInterfaceInformation(NetworkInterface netint)
        throws SocketException
        out.printf("Display name: %s\n",
        out.printf("Name: %s\n", netint.getName());
        Enumeration<InetAddress> inetAddresses
            = netint.getInetAddresses();
        // Output System IP
        for (InetAddress inetAddress :
             Collections.list(inetAddresses)) {
            out.printf("System IP: %s\n", inetAddress);
Display name: eth0
Name: eth0

Display name: lo
Name: lo
System IP: /

Output in Windows:

Output in Linux:

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