From f429e707ff6778147be5f2aa4ebfa99ff1449f79 Mon Sep 17 00:00:00 2001
From: Harry9656 <singharpal9656@gmail.com>
Date: Tue, 26 Apr 2022 05:02:53 +0200
Subject: [PATCH] Added IPAddressLookup (#12097)

---
 .../baeldung/iplookup/IPAddressLookup.java    | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 core-java-modules/core-java-networking-3/src/main/java/com/baeldung/iplookup/IPAddressLookup.java

diff --git a/core-java-modules/core-java-networking-3/src/main/java/com/baeldung/iplookup/IPAddressLookup.java b/core-java-modules/core-java-networking-3/src/main/java/com/baeldung/iplookup/IPAddressLookup.java
new file mode 100644
index 0000000000..30ad5a503d
--- /dev/null
+++ b/core-java-modules/core-java-networking-3/src/main/java/com/baeldung/iplookup/IPAddressLookup.java
@@ -0,0 +1,50 @@
+package com.baeldung.iplookup;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.net.SocketException;
+import java.net.URL;
+import java.net.UnknownHostException;
+
+public class IPAddressLookup {
+    public static void main(String[] args) {
+        System.out.println("UDP connection IP lookup: " + getLocalIpAddressUdp());
+        System.out.println("Socket connection IP lookup: " + getLocalIpAddressSocket());
+        System.out.println("AWS connection IP lookup: " + getPublicIpAddressAws());
+    }
+
+    public static String getLocalIpAddressUdp() {
+        try (final DatagramSocket datagramSocket = new DatagramSocket()) {
+            datagramSocket.connect(InetAddress.getByName("8.8.8.8"), 12345);
+            return datagramSocket.getLocalAddress().getHostAddress();
+        } catch (SocketException | UnknownHostException exception) {
+            throw new RuntimeException(exception);
+        }
+    }
+
+    public static String getLocalIpAddressSocket() {
+        try (Socket socket = new Socket()) {
+            socket.connect(new InetSocketAddress("google.com", 80));
+            return socket.getLocalAddress().getHostAddress();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static String getPublicIpAddressAws() {
+        try {
+            String urlString = "http://checkip.amazonaws.com/";
+            URL url = new URL(urlString);
+            try (BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()))) {
+                return br.readLine();
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}