Help Center/ Virtual Private Cloud/ FAQs/ VPCs and Subnets/ What Subnet CIDR Blocks Are Available?

Updated on 2024-07-30 GMT+08:00

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What Subnet CIDR Blocks Are Available?

A subnet is a unique CIDR block with a range of IP addresses in a VPC. All cloud resources in a VPC must be deployed on subnets.

The subnet CIDR block must be within the VPC CIDR block. Subnet CIDR blocks in a VPC must be unique. A subnet mask can be between the netmask of its VPC CIDR block and /29 netmask. If a VPC CIDR block is 10.0.0.0/16, its subnet mask can between 16 to 29.

For example, if the CIDR block of a VPC is 10.0.0.0/16, you can specify 10.0.0.0/24 for a subnet in this VPC, 10.0.1.0/24 for the second subnet, and 10.0.2.0/24 for the third subnet.

Parent topic: VPCs and Subnets

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