How Can I Get a Machine\'s External IP Address in Java?

Getting the Machine's External IP Address in Java

Locating a machine's external IP address, as viewed by devices outside its network, can be a challenge in Java. The provided IpAddress class only fetches the local IP address. To obtain the external IP, consider the following solutions:

External Services

It may not be feasible to retrieve the external IP from code running on the local machine. Instead, you can:

• Use a website with a service that returns the IP address: This involves creating code that accesses the website (e.g., using JSP) and parsing the returned information to extract the IP address.
• Utilize existing websites or services: These services provide the external IP when queried. You can then parse the response to obtain the desired information.

Web Services

One effective method involves employing web services like AWS:

import java.net.*;
import java.io.*;

URL whatismyip = new URL("http://checkip.amazonaws.com");
BufferedReader in = new BufferedReader(new InputStreamReader(
                whatismyip.openStream()));

String ip = in.readLine(); //you get the IP as a String
System.out.println(ip);

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