Amazon Virtual Private Cloud (VPC) is a fundamental building block of Amazon Web Services (AWS), providing users with a logically isolated section of the AWS Cloud where they can launch resources. As organizations architect their infrastructure in the cloud, it's crucial to understand the limits imposed on VPCs and subnets. In this blog post, we'll explore the maximum number of total VPCs per account/region and the limits on subnets within a VPC.
VPC Limits
Total VPCs per Account
As of my last knowledge update in January 2022, AWS allows you to create up to a maximum of 5 VPCs per AWS account per AWS Region. This limit is in place to prevent over-provisioning of VPCs and to ensure efficient use of AWS resources.
VPCs Across Regions
It's important to note that the limit of 5 VPCs is specific to each AWS Region. Therefore, if you're operating in multiple regions, you can create up to 5 VPCs in each region. This enables users to design and deploy their infrastructure with geographic redundancy and compliance with regional data residency requirements.
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Subnet Limits
Subnets per VPC
Within a single VPC, AWS allows you to create up to 200 subnets. Subnets are essential for segmenting and organizing resources within a VPC, and the limit of 200 provides flexibility for designing complex networking architectures.
Size of IP Address Range
Each subnet in a VPC is associated with an IP address range. The size of this range is defined in CIDR notation, and the minimum size allowed for a subnet is a /28 (16 IP addresses). The maximum size is a /16, allowing for up to 65,536 IP addresses in a subnet.
Strategies for Efficient VPC and Subnet Management
Resource Consolidation: Where feasible, consider consolidating related resources within the same VPC to make optimal use of the limited VPC count.
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Proactive Planning: Plan your IP address ranges and subnet sizes carefully to avoid running into limitations as your infrastructure scales.
Multi-Region Architecture: Leverage the allowance of 5 VPCs per region to create a well-architected, geographically distributed infrastructure.
Use of NAT Gateways: When designing subnets, consider the use of NAT Gateways to enable instances in private subnets to access the internet while remaining secure. |
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