diff --git a/app/build.gradle b/app/build.gradle
index 4483376..6c443b5 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,6 +10,10 @@ plugins {
     id 'application'
 }
 
+application {
+    mainClass = 'clientserver.App'
+}
+
 repositories {
     // Use Maven Central for resolving dependencies.
     mavenCentral()
diff --git a/app/src/main/java/clientserver/App.java b/app/src/main/java/clientserver/App.java
index 5b5d284..4d73374 100644
--- a/app/src/main/java/clientserver/App.java
+++ b/app/src/main/java/clientserver/App.java
@@ -1,6 +1,3 @@
-/*
- * This source file was generated by the Gradle 'init' task
- */
 package clientserver;
 
 public class App {
@@ -10,5 +7,7 @@ public class App {
 
     public static void main(String[] args) {
         System.out.println(new App().getGreeting());
+
+        Server.scannerUDP(1000, 5000);
     }
 }
diff --git a/app/src/main/java/clientserver/Server.java b/app/src/main/java/clientserver/Server.java
new file mode 100644
index 0000000..ab8d74c
--- /dev/null
+++ b/app/src/main/java/clientserver/Server.java
@@ -0,0 +1,18 @@
+package clientserver;
+
+import java.net.DatagramSocket;
+
+public class Server {
+    static void scannerUDP(int startPort, int endPort) {
+        try {
+            for (int i = startPort; i < endPort; i++) {
+                try (DatagramSocket socket = new DatagramSocket(i)) {
+                } catch (Exception e) {
+                    System.out.println("Port n°" + i + " déjà occupé");
+                }
+            }
+        } catch (Exception e) {
+            System.out.println(e);
+        }
+    }
+}