What is the best approch to setup custom domain with static IP for AppEngine

Question

I had done an investigation on below

1. Adding custom domain through AppEngine settings - Doesn\'t seem to be static IP, it uses Google NS.
2. Setting up VM

Answer 1

As you can see at this documentation, "App Engine does not currently provide a way to map static IP addresses to an application. In order to optimize the network path between an end user and an App Engine application, end users on different ISPs or geographic locations might use different IP addresses to access the same App Engine application". So, there is no way to set a static IP address to App Engine but you can use a use a pool of IP address. In the shared link, you can find the way to use ranges of IP address in App Engine. This other link, explain a bit more how to do it.