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Given I have a known cidr space (/18) and know how that is partitioned across subnets (using awsx logic), how can I use <https://www.pulumi.com/docs/reference/pkg/nodejs/pulumi/awsx/ec2/#getIPv4Address|getIPV4Address(value)> to create some private fixed addresses in my network? Unsure what `value: number` is here.

That method is a member of the  ExistingVpcArgs interface; it's used for looking up an existing VPC. Not what you want.

As a matter of course, don't use the old "docs" links when reading API specs. Use the registry. I don't know why the old docs links work still...

To associate a _private_ IPv4 address with an EC2 instance, use the `privateIp` property for the args constructor parameter of an instance: <https://www.pulumi.com/registry/packages/aws/api-docs/ec2/instance/#privateip_nodejs>

Thank you for the note about the old docs, I had not even registered that.