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If you received a notification that the inbound IP address of your Azure App Service app is changing, follow these instructions.
Determine if you need to do anything
Option 1: If your App Service app doesn't have a custom domain, no action is required.
Option 2: If only a CNAME record (DNS record pointing to a URI) is configured in your Domain Registration Portal (non-Microsoft DNS provider or Azure DNS), no action is required.
Option 3: If an A record (DNS record pointing directly to your IP address) is configured in your Domain Registration Portal (non-Microsoft DNS provider or Azure DNS), replace the existing IP address with the new one. You can find the new IP address by following the instructions in the next section.
Option 4: If your application is behind a load balancer, IP filter, or any other IP mechanism that requires your app's IP address, replace the existing IP address with the new one. You can find the new IP address by following the instructions in the next section.
Find the new inbound IP address in the Azure portal
Both the new inbound IP address and the old one are connected to your app now, and later the old one will be disconnected.
Sign in to the Azure portal.
Search for and select App Services, then select your App Service app from the list.
If the app is a function app, see Function app inbound IP address.
Under Settings in the sidebar menu, select Networking and find the section labeled Inbound addresses.
Copy the IP address and reconfigure your domain record or IP mechanism.