diff --git a/src/screens/AdminScreen.tsx b/src/screens/AdminScreen.tsx
index ad39bfbf..a2326377 100644
--- a/src/screens/AdminScreen.tsx
+++ b/src/screens/AdminScreen.tsx
@@ -213,7 +213,11 @@ export default function AdminScreen({ currentSettings, onSave, onClose }: AdminS
 
     const ipTrimmed = printerIp.trim();
     const ipRegex = /^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/;
-    if (ipTrimmed !== '' && ipTrimmed !== '192.168.' && !ipRegex.test(ipTrimmed)) {
+    if (!ipTrimmed) {
+      Alert.alert('Ungültige Eingabe', 'Die Drucker-IP-Adresse darf nicht leer sein.');
+      return;
+    }
+    if (!ipRegex.test(ipTrimmed)) {
       Alert.alert('Ungültige Eingabe', 'Bitte gib eine gültige IP-Adresse ein (z.B. 192.168.1.100).');
       return;
     }
diff --git a/src/services/settings.ts b/src/services/settings.ts
index ae7c23b5..c652256b 100644
--- a/src/services/settings.ts
+++ b/src/services/settings.ts
@@ -35,7 +35,7 @@ const settingsFile = new File(Paths.document, 'settings.json');
 const DEFAULT_SETTINGS: AppSettings = {
   appLastUpdate: null,
   countdownDuration: 3,
-  printerIp: '192.168.',
+  printerIp: '192.168.0.1',
   adminPassword: '1234',
   kioskModeEnabled: false,
   frameMode: 'available',