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 |
![](https://support.huaweicloud.com/eu/vpc_faq/public_sys-resources/notice_3.0-en-us.png)
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.
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