diff --git a/server/lib/readConfigFile.ts b/server/lib/readConfigFile.ts
index cca0aa6aa..f6c8592e9 100644
--- a/server/lib/readConfigFile.ts
+++ b/server/lib/readConfigFile.ts
@@ -302,8 +302,8 @@ export const configSchema = z
             .optional()
             .default({
                 block_size: 24,
-                subnet_group: "100.90.128.0/24",
-                utility_subnet_group: "100.96.128.0/24"
+                subnet_group: "100.90.128.0/20",
+                utility_subnet_group: "100.96.128.0/20"
             }),
         rate_limits: z
             .object({