Merge pull request #306964 from seligj95/subnetchange

ASE add subnet change info and remove auto-migration doc

Author: Stacyrch140

articles/app-service/environment/networking.md

@@ -3,7 +3,7 @@ title: App Service Environment networking
 description: App Service Environment networking details
 author: seligj95
 ms.topic: overview
-ms.date: 09/02/2025
+ms.date: 10/15/2025
 ms.author: jordanselig
 ms.service: azure-app-service
 ---
@@ -22,6 +22,10 @@ The following are the minimum set of requirements for the subnet your App Servic
 
 The size of the subnet can affect the scaling limits of the App Service plan instances within the App Service Environment. For production scale, we recommend a `/24` address space (256 addresses) for your subnet. If you plan to scale near max capacity of 200 instances in our App Service Environment and you plan frequent up/down scale operations, we recommend a `/23` address space (512 addresses) for your subnet.
 
+>[!NOTE]
+> It's now possible to move your App Service Environment to a new subnet. To move your App Service Environment to a new subnet, create a support ticket. A support ticket is required because there are prerequisites and configurations that need to be validated and properly configured before changing the subnet to ensure a successful migration. Failure to properly migrate can lead to downtime and connectivity issues.
+> 
+
 If you use a smaller subnet, be aware of the following limitations:
 
 - Any particular subnet has five addresses reserved for management purposes. In addition to the management addresses, App Service Environment dynamically scales the supporting infrastructure, and uses between 7 and 27 addresses, depending on the configuration and load. You can use the remaining addresses for instances in the App Service plan. The minimal size of your subnet is a `/27` address space (32 addresses).

articles/app-service/environment/toc.yml

@@ -47,10 +47,6 @@
     href: how-to-custom-domain-suffix.md
   - name: Upgrade preference for planned maintenance
     href: how-to-upgrade-preference.md
-- name: Migrate to an App Service Environment v3
-  items:
-  - name: Auto-migration overview
-    href: auto-migration.md
 - name: Resources
   items:
   - name: Azure Roadmap