Posted On: Jan 25, 2023

AWS announces the general availability of Amazon provided IPv6 contiguous Classless Inter-Domain Routing (CIDR) blocks with Amazon VPC IP Address Manager (IPAM). Within IPAM, customers can create IPv6 publicly scoped pools and provision with BYOIP CIDR blocks. Now, customers can provision Amazon provided IPv6 CIDR blocks from /52 up to /40 in size into separate pools for association to Virtual Private Clouds (VPCs). Contiguous CIDR blocks can be used for sequential VPC creation. CIDRs can then be aggregated in a single entry across networking and security constructs like access control lists, route tables, security groups, and firewalls.  

Before today, customers could use bring your own IP addresses (BYOIP) to have sequential VPCs. This means you could purchase an IP range from your Regional Internet Registry (RIR) and AWS would validate ownership prior to using the CIDR. Alternatively, customers could create a VPC directly with an Amazon provided IPv6 CIDR block. In this case, the CIDR is not sequential with any existing customer CIDRs, and it is ephemeral, existing within the customer account for the life of the VPC. With Amazon provided contiguous IPv6 CIDR blocks, network administrators can provision an IPv6 CIDR block with just a few clicks. Then they can plan, segment, and allocate IP space based on different use cases such as applications, teams, or environments. Now, customers will retain these CIDR blocks beyond the life of the VPC. Amazon provided IPv6 CIDR blocks are available in a default size of /52, which supports addressing for up to 16 VPCs. Customers can receive additional and larger CIDR block allocations by request.  

Amazon provided contiguous IPv6 CIDR blocks are now available in Africa (Cape Town), Asia Pacific (Hong-Kong), Asia Pacific (Mumbai), Asia Pacific (Osaka), Asia Pacific (Sydney), Asia Pacific (Tokyo), Asia Pacific (Seoul), Asia Pacific (Singapore), Canada (Central), Europe (Dublin), Europe (Frankfurt), Europe (London), Europe (Milan), Europe (Paris), Europe (Stockholm), Middle East (Bahrain), South America (Sao Paulo), US West (Northern California), US East (N. Virginia), US East (Ohio), US West (Oregon), AWS GovCloud (US-East) and AWS GovCloud (US-West). It comes at no additional cost. To learn more and get started, please see the VPC FAQ page and review the latest VPC IPAM Documentation.