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An Amazon VPC address range may be as large as /16 (65,536 available addresses) or as small as /28 (16 available addresses) and should not overlap any other network with which they are to be connected.


Cover of AWS Certified Solutions Architect Official Study Guide


Unique IP addresses in CIDR notation in ipv4 = 2 power (32-mask)

E.g: The CIDR address of will give 2 power ( 32-28) = 2 power 4 = 16 addresses