update azure ip range

windows/security/threat-protection/windows-defender-atp/configure-proxy-internet-windows-defender-advanced-threat-protection.md

@@ -11,7 +11,7 @@ ms.pagetype: security
 ms.author: macapara
 author: mjcaparas
 ms.localizationpriority: medium
-ms.date: 09/12/2018
+ms.date: 11/14/2018
 ---
 
 
@@ -101,10 +101,11 @@ United States | ```us.vortex-win.data.microsoft.com```<br> ```us-v20.events.data
 
 If a proxy or firewall is blocking anonymous traffic, as Windows Defender ATP  sensor is connecting from system context, make sure anonymous traffic is permitted in the above listed URLs.
 
-### IP range 
-You'll need to whitelist the following Azure IP addresses/ranges published on [Microsoft Azure Datacenter IP Ranges](https://www.microsoft.com/en-us/download/details.aspx?id=41653).
+## Windows Defender ATP service backend IP range 
+If you network devices don't support the URLs white-listed in the prior section, you can use the following information.
+
+Windows Defender ATP is built on Azure cloud, deployed in the following regions:
 
-The Windows Defender ATP service is deployed in the following regions:
 - \+\<Region Name="uswestcentral">
 - \+\<Region Name="useast2">
 - \+\<Region Name="useast">
@@ -114,6 +115,11 @@ The Windows Defender ATP service is deployed in the following regions:
 - \+\<Region Name="ukwest">
 
 
+You can find the Azure IP range on [Microsoft Azure Datacenter IP Ranges](https://www.microsoft.com/en-us/download/details.aspx?id=41653).
+
+>[!NOTE]
+> As a cloud-based solution, the IP range can change. It's recommended you move to DNS resolving setting.
+
 
 ## Verify client connectivity to Windows Defender ATP service URLs