Java Examples - Host Specific IP Address


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Problem Description

How to find hostname from IP Address ?

Solution

Following example shows how to change the host name to its specific IP address with the help of InetAddress.getByName() method of net.InetAddress class.

import java.net.InetAddress;

public class Main {
   public static void main(String[] argv) throws Exception {
      InetAddress addr = InetAddress.getByName("74.125.67.100");
      System.out.println("Host name is: "+addr.getHostName());
      System.out.println("Ip address is: "+ addr.getHostAddress());
   }
}

Result

The above code sample will produce the following result.

http://www.javatutorial.com = 123.14.2.35

The following is an example to find hostname from IP Address

import java.net.InetAddress;
import java.net.UnknownHostException;

public class NewClass1 {
   public static void main(String[] args) {
      InetAddress ip;
      String hostname;
      try {
         ip = InetAddress.getLocalHost();
         hostname = ip.getHostName();
         System.out.println("Your current IP address : " + ip);
         System.out.println("Your current Hostname : " + hostname);
      } catch (UnknownHostException e) {
         e.printStackTrace();
      }
   }
}

The above code sample will produce the following result.

Your current IP address : localhost/127.0.0.1
Your current Hostname : localhost

java_networking.htm

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