Merge pull request #232821 from seligj95/patch-1

Update version-comparison.md

Author: prmerger-automator[bot]

articles/app-service/environment/version-comparison.md

@@ -2,7 +2,7 @@
 title: 'App Service Environment version comparison'
 description: This article provides an overview of the App Service Environment versions and feature differences between them.
 author: seligj95
-ms.date: 3/20/2023
+ms.date: 3/30/2023
 ms.author: jordanselig
 ms.topic: article
 ---
@@ -42,6 +42,7 @@ App Service Environment has three versions. App Service Environment v3 is the la
 |Network watcher or NSG flow logs to monitor traffic    |Yes         |Yes         |Yes         |
 |Subnet delegation   |Not required         |Not required         |[Must be delegated to `Microsoft.Web/hostingEnvironments`](networking.md#subnet-requirements)       |
 |Subnet size|An App Service Environment v1 with no App Service plans uses 12 addresses before you create an app. If you use an ILB App Service Environment v1, then it uses 13 addresses before you create an app. As you scale out, infrastructure roles are added at every multiple of 15 and 20 of your App Service plan instances.  |An App Service Environment v2 with no App Service plans uses 12 addresses before you create an app. If you use an ILB App Service Environment v2, then it uses 13 addresses before you create an app. As you scale out, infrastructure roles are added at every multiple of 15 and 20 of your App Service plan instances.  |Any particular subnet has five addresses reserved for management purposes. In addition to the management addresses, App Service Environment v3 dynamically scales the supporting infrastructure, and uses between 4 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 can be a /27 address space (32 addresses).  |
+|DNS fallback |Azure DNS |Azure DNS |[Ensure that you have a forwarder to a public DNS or include Azure DNS in the list of custom DNS servers](migrate.md#migration-feature-limitations) |
 
 ### Scaling