Java Program to Print All Local IP Addresses

We can use the following Java command line program to print all loacal IP addresses of the computer. We iterate over all Net-Interfaces and get Inet Addresses.

package com.helloacm;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;

public class Main {
    public static void main(String[] args) {
        try {
            var allNetInterfaces = NetworkInterface.getNetworkInterfaces();
            InetAddress ip = null;
            while (allNetInterfaces.hasMoreElements()) {
                var netInterface = (NetworkInterface) allNetInterfaces.nextElement();
                var addresses = netInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    ip = (InetAddress) addresses.nextElement();
                    if (ip != null && ip instanceof Inet4Address) {
                        System.out.println(ip.getHostAddress());
                    }
                }
            }
        } catch (Exception e) {
            System.err.println(e.getMessage());
        }
    }
}

Example output from the command line:

127.0.0.1
192.168.1.94
192.168.56.1
172.28.224.1

See also: The DNS Lookup Tool in Java (InetAddress)

–EOF (The Ultimate Computing & Technology Blog) —