# IPv6-only Subnets in a Dual Stack Amazon Amazon VPC
Publication date: **June 23, 2022 ([Diagram history](#ipv6-2-diagram-history))**
This architecture shows how to integrate IPv6-only subnets in your dual stack Amazon VPC. IPv6-only subnets can coexist with IPv4-only and dual stack subnets in the same Amazon VPC.
## IPv6-only subnets in a dual stack Amazon Amazon VPC architecture
The following numbered items describe the key components in this architecture:
1. To create IPv6-only subnets, you start with a dual stack Amazon Amazon VPC. The Amazon VPC needs to have a secondary IPv6 CIDR associated with it.
1. IPv6-only subnets only have an IPv6 CIDR associated with them, and do not need associated IPv4 CIDRs. IPv6-only subnets are bound to an Availability Zone the same as dual stack or IPv4-only subnets.
1. IPv6-only subnets can coexist in the same Amazon VPC as IPv4-only subnets and dual stack subnets. You can also choose to have dual stack VPCs with IPv6-only subnets, but keep in mind that the primary Amazon VPC CIDR is an IPv4 CIDR.
1. When you create an Amazon EC2 instance in the IPv6-only subnet, the IPv6 address is either automatically assigned from the subnet CIDR through DHCPv6, or you can manually configure it.
1. IPv6-only resources in IPv6-only subnets can communicate natively over IPv6 with other IPv6-only resources or dual stack resources in other subnets in the Amazon VPC.
1. IPv4-only resources in the IPv4-only subnets can communicate natively over IPv4 with other IPv4-only resources or dual stack resources in other subnets in the Amazon VPC.
**Note**
IPv6-only resources in the IPv6-only subnets cannot communicate with IPv4-only resources in other subnets in the Amazon VPC.
## Further reading
For additional information, see the following resources:
+ [AWS Architecture Icons](https://aws.amazon.com/architecture/icons)
+ [AWS Well-Architected](https://aws.amazon.com/architecture/well-architected)
## Diagram history
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| Change | Description | Date |
| --- |--- |--- |
| [Initial publication](ipv6-dual-stack-internet.md#ipv6-1-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](#ipv6-2-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-only-internet.md#ipv6-3-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-alb-ipv4-targets.md#ipv6-4-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-alb-ipv6-targets.md#ipv6-5-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-nlb-ipv4-targets.md#ipv6-6-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-nlb-ipv6-targets.md#ipv6-7-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-internal-elb.md#ipv6-8-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-dns64.md#ipv6-9-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-nat64.md#ipv6-10-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-centralized-egress-nat64.md#ipv6-11-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-vpc-peering.md#ipv6-12-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-transit-gateway.md#ipv6-13-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-privatelink.md#ipv6-14-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-direct-connect.md#ipv6-15-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-vpn-tgw.md#ipv6-16-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
| [Initial publication](ipv6-tgw-connect.md#ipv6-17-diagram-history) | Reference architecture diagram first published. | June 23, 2022 |
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