What is the maximum and minimum CIDR block size allowed while creating a VPC and its subnets in Google Cloud Platform?
3 Answers
You can create a VPC network with a subnet that has 10.0.0.0/8 which works just fine. While the smallest possible subnet is a /29
By default, VPC networks do not have any IP address ranges associated with them. When you create a subnet, you must define a primary IP address range. You can optionally define one or more secondary ranges:
So, the answer to the question is that CIDR range mask length must not be greater than 29, which means that the minimum allowed is /29, while the maximum is /9.
Example:
Private Address Ranges for class A, B and C networks
Class Private IP Address Range Subnet Mask
A 10.0.0.0 10.255.255.255 255.0.0.0 | 24-bit block
B 172.16.0.0 172.31.255.255 255.240.0.0 | 20-bit block
C 192.168.0.0 192.168.255.255 255.255.0.0 | 16-bit block
each vpc is a closed environment, so you can define a valid IPv4 range, I never had to define a network bigger than a /8, but I don't see why .
For the subnets I suggest a quick look at this part of the documentation: https://cloud.google.com/vpc/docs/vpc#manually_created_subnet_ip_ranges
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