Java - get host name and IP address of local machine

In this short article, we would like to show how to get localhost host name and IP address using Java.

Quick solution:

// import java.net.InetAddress;

InetAddress address = InetAddress.getLocalHost();
    	
String hostName = address.getHostName();
String hostAddress = address.getHostAddress();  // IPv4 or IPv6

Simple example

import java.net.InetAddress;

public class Program {
	
    public static void main(String[] args) throws Exception {
	
    	InetAddress address = InetAddress.getLocalHost();
    	
    	System.out.println("My host name is:  " + address.getHostName());
        System.out.println("My IP address is: " + address.getHostAddress());
	}
}

Example output:

My host name is:  DESKTOP-U147DNR
My IP address is: 192.168.56.1

Complex example

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

public class Program {
	
    public static void main(String[] args) throws Exception {

        printNetworkInterfaces(NetworkInterface.getNetworkInterfaces());
	}

    private static void printNetworkInterfaces(Enumeration<NetworkInterface> networkInterfaces) {
        while (networkInterfaces.hasMoreElements()) {
            NetworkInterface networkInterface = networkInterfaces.nextElement();
            System.out.println("Interface name: " + networkInterface.getName());
            printInetAddresses(networkInterface.getInetAddresses());
        }
    }

    private static void printInetAddresses(Enumeration<InetAddress> inetAddresses) {
        while (inetAddresses.hasMoreElements()) {
            InetAddress inetAddress = inetAddresses.nextElement();
            System.out.println("                " + inetAddress.getHostName() + "  " + inetAddress.getHostAddress());
        }
    }
}

Example output:

Interface name: lo
                127.0.0.1  127.0.0.1
                0:0:0:0:0:0:0:1  0:0:0:0:0:0:0:1
Interface name: eth0
                DESKTOP-U147DNR  192.168.56.1
                DESKTOP-U147DNR  fe80:0:0:0:8c21:8c20:8ae8:fd66%eth0
Interface name: wlan0
                DESKTOP-U147DNR.home  192.168.1.113
                80fe:0:0:0:5522:2db2:7ea1:4c44%wlan0  80fe:0:0:0:5522:2db2:7ea1:4c44%wlan0