diff --git a/modules/pihole/bootstrap.php b/modules/pihole/bootstrap.php
index e5792a9..4351194 100644
--- a/modules/pihole/bootstrap.php
+++ b/modules/pihole/bootstrap.php
@@ -26,24 +26,76 @@ $mm->registerFunction($moduleName, 'instances', function () use ($moduleName): a
     $verifyTls = !isset($settings['verify_tls']) || $settings['verify_tls'] === '1' || $settings['verify_tls'] === 1 || $settings['verify_tls'] === true;
 
     $instances = [];
-    foreach (['primary', 'secondary'] as $key) {
-        $urlKey = $key . '_url';
-        $tokenKey = $key . '_token';
-        $nameKey = $key . '_name';
-        $url = trim((string)($settings[$urlKey] ?? ''));
-        if ($url === '') {
-            continue;
+
+    $rawJson = trim((string)($settings['instances_json'] ?? ''));
+    if ($rawJson !== '') {
+        $decoded = json_decode($rawJson, true);
+        if (is_array($decoded)) {
+            foreach ($decoded as $row) {
+                if (!is_array($row)) {
+                    continue;
+                }
+                $id = trim((string)($row['id'] ?? ''));
+                $url = trim((string)($row['url'] ?? ''));
+                if ($id === '' || $url === '') {
+                    continue;
+                }
+                $instances[$id] = [
+                    'id' => $id,
+                    'name' => trim((string)($row['name'] ?? '')) ?: $id,
+                    'url' => rtrim($url, '/'),
+                    'token' => trim((string)($row['token'] ?? '')),
+                    'api_path' => $apiPath,
+                    'timeout' => $timeout,
+                    'verify_tls' => $verifyTls,
+                    'is_primary' => !empty($row['is_primary']),
+                ];
+            }
+        }
+    }
+
+    if (empty($instances)) {
+        foreach (['primary', 'secondary'] as $key) {
+            $urlKey = $key . '_url';
+            $tokenKey = $key . '_token';
+            $nameKey = $key . '_name';
+            $url = trim((string)($settings[$urlKey] ?? ''));
+            if ($url === '') {
+                continue;
+            }
+            $instances[$key] = [
+                'id' => $key,
+                'name' => trim((string)($settings[$nameKey] ?? '')) ?: ($key === 'primary' ? 'Primaer' : 'Sekundaer'),
+                'url' => rtrim($url, '/'),
+                'token' => trim((string)($settings[$tokenKey] ?? '')),
+                'api_path' => $apiPath,
+                'timeout' => $timeout,
+                'verify_tls' => $verifyTls,
+                'is_primary' => $key === 'primary',
+            ];
+        }
+    }
+
+    $primaryId = trim((string)($settings['primary_id'] ?? ''));
+    if ($primaryId !== '' && isset($instances[$primaryId])) {
+        foreach ($instances as $id => &$row) {
+            $row['is_primary'] = ($id === $primaryId);
+        }
+        unset($row);
+    } else {
+        $hasPrimary = false;
+        foreach ($instances as $row) {
+            if (!empty($row['is_primary'])) {
+                $hasPrimary = true;
+                break;
+            }
+        }
+        if (!$hasPrimary && $instances) {
+            $firstKey = array_key_first($instances);
+            if ($firstKey !== null) {
+                $instances[$firstKey]['is_primary'] = true;
+            }
         }
-        $instances[$key] = [
-            'id' => $key,
-            'name' => trim((string)($settings[$nameKey] ?? '')) ?: ($key === 'primary' ? 'Primaer' : 'Sekundaer'),
-            'url' => rtrim($url, '/'),
-            'token' => trim((string)($settings[$tokenKey] ?? '')),
-            'api_path' => $apiPath,
-            'timeout' => $timeout,
-            'verify_tls' => $verifyTls,
-            'is_primary' => $key === 'primary',
-        ];
     }
 
     return $instances;
diff --git a/modules/pihole/module.json b/modules/pihole/module.json
index 31ef237..c8d5ef2 100644
--- a/modules/pihole/module.json
+++ b/modules/pihole/module.json
@@ -21,12 +21,14 @@
   },
   "setup": {
     "fields": [
-      { "name": "primary_name", "label": "Primaer-Name", "type": "text", "required": false, "help": "Anzeige-Name (z.B. Pi-hole Main)" },
-      { "name": "primary_url", "label": "Primaer-URL", "type": "text", "required": true, "help": "Basis-URL der Instanz, z.B. http://pi-hole.local" },
-      { "name": "primary_token", "label": "Primaer-API Token", "type": "password", "required": false, "help": "Token aus dem Pi-hole Admin (API Token)." },
-      { "name": "secondary_name", "label": "Sekundaer-Name", "type": "text", "required": false, "help": "Anzeige-Name (z.B. Pi-hole Backup)" },
-      { "name": "secondary_url", "label": "Sekundaer-URL", "type": "text", "required": false, "help": "Basis-URL der zweiten Instanz" },
-      { "name": "secondary_token", "label": "Sekundaer-API Token", "type": "password", "required": false },
+      { "name": "instances_json", "label": "Instanzen (JSON)", "type": "textarea", "required": false, "help": "Mehrere Instanzen als JSON-Array. Beispiel: [{\"id\":\"pihole-main\",\"name\":\"Pi-hole Main\",\"url\":\"http://pi-hole.local\",\"token\":\"TOKEN\",\"is_primary\":true},{\"id\":\"pihole-backup\",\"name\":\"Pi-hole Backup\",\"url\":\"http://pi-hole-2.local\",\"token\":\"TOKEN2\"}]" },
+      { "name": "primary_id", "label": "Primaer-ID (optional)", "type": "text", "required": false, "help": "Wenn gesetzt, wird diese Instanz als Primaer fuer Listen-Updates genutzt." },
+      { "name": "primary_name", "label": "Primaer-Name (Legacy)", "type": "text", "required": false, "help": "Anzeige-Name (z.B. Pi-hole Main)" },
+      { "name": "primary_url", "label": "Primaer-URL (Legacy)", "type": "text", "required": false, "help": "Basis-URL der Instanz, z.B. http://pi-hole.local" },
+      { "name": "primary_token", "label": "Primaer-API Token (Legacy)", "type": "password", "required": false, "help": "Token aus dem Pi-hole Admin (API Token)." },
+      { "name": "secondary_name", "label": "Sekundaer-Name (Legacy)", "type": "text", "required": false, "help": "Anzeige-Name (z.B. Pi-hole Backup)" },
+      { "name": "secondary_url", "label": "Sekundaer-URL (Legacy)", "type": "text", "required": false, "help": "Basis-URL der zweiten Instanz" },
+      { "name": "secondary_token", "label": "Sekundaer-API Token (Legacy)", "type": "password", "required": false },
       { "name": "api_path", "label": "API Pfad", "type": "text", "required": false, "help": "Standard: /admin/api.php" },
       { "name": "api_timeout_sec", "label": "API Timeout (Sek.)", "type": "number", "required": false, "help": "Standard 8" },
       { "name": "verify_tls", "label": "TLS Verifikation aktiv", "type": "checkbox", "required": false, "help": "Deaktivieren nur wenn das Zertifikat unsicher ist." },
diff --git a/modules/pihole/pages/api.php b/modules/pihole/pages/api.php
index 0191056..addb72d 100644
--- a/modules/pihole/pages/api.php
+++ b/modules/pihole/pages/api.php
@@ -97,10 +97,26 @@ $apiRequest = function (array $instance, array $params) use ($normalizeApiPath):
     return ['ok' => true, 'data' => $data, 'http_code' => $httpCode, 'url' => $full];
 };
 
-$pickInstances = function (string $target) use ($instances): array {
+$resolvePrimaryId = function () use ($instances): ?string {
+    foreach ($instances as $id => $row) {
+        if (!empty($row['is_primary'])) {
+            return $id;
+        }
+    }
+    $first = array_key_first($instances);
+    return $first !== null ? (string)$first : null;
+};
+
+$pickInstances = function (string $target) use ($instances, $resolvePrimaryId): array {
     if ($target === 'all') {
         return $instances;
     }
+    if ($target === 'primary') {
+        $primaryId = $resolvePrimaryId();
+        if ($primaryId !== null && isset($instances[$primaryId])) {
+            return [$primaryId => $instances[$primaryId]];
+        }
+    }
     if (isset($instances[$target])) {
         return [$target => $instances[$target]];
     }