Which CIDR Blocks Are Available for the VPC Service?
- Number of IP addresses: Reserve sufficient IP addresses in case of business growth.
- IP address range: Avoid IP address conflicts if you need to connect a VPC to an on-premises data center or connect two VPCs.
VPC CIDR Block |
IP Address Range |
Maximum Number of IP Addresses |
---|---|---|
10.0.0.0/8-24 |
10.0.0.0-10.255.255.255 |
2^24-2=16777214 |
172.16.0.0/12-24 |
172.16.0.0-172.31.255.255 |
2^20-2=1048574 |
192.168.0.0/16-24 |
192.168.0.0-192.168.255.255 |
2^16-2=65534 |
Table 1 describes the primary IPv4 CIDR blocks available for a VPC. After a VPC is created, its primary CIDR block cannot be modified. If the primary CIDR block is insufficient, you can add a secondary IPv4 CIDR block for the VPC.
VPCs and Subnets FAQs
- What Is Virtual Private Cloud?
- Which CIDR Blocks Are Available for the VPC Service?
- How Many VPCs Can I Create?
- Can Subnets Communicate with Each Other?
- What Subnet CIDR Blocks Are Available?
- Can I Modify the CIDR Block of a Subnet?
- How Many Subnets Can I Create?
- How Do I Make the Changed DHCP Lease Time of a Subnet Take Effect Immediately?
- How Can I Make a Domain Name in a Subnet Take Effect Immediately After Being Changed?
- Why Can't I Delete My VPCs and Subnets?
- Can I Change the VPC of an ECS?
- Why Is the ECS IP Address Released After the System Time Is Changed?
- How Do I Change the DNS Server Address of an ECS?
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