# Connect to Amazon SNS using Dual-stack (IPv4 and IPv6) endpoints
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 Dual-stack endpoints support both IPv4 and IPv6 traffic. When you make a request to a dual-stack endpoint, the endpoint URL resolves to an IPv4 or an IPv6 address. For more information on dual-stack and FIPS endpoints, see the [SDK Reference guide](https://docs.aws.amazon.com/sdkref/latest/guide/feature-endpoints.html). 

 Amazon SNS supports Regional dual-stack endpoints, which means that you must specify the AWS Region as part of the endpoint name. Dual-stack endpoint names use the following naming convention: `sns.{{Region}}.amazonaws.com`. For example, the dual-stack endpoint name for the `eu-west-1` Region is `sns.{{eu-west-1}}.amazonaws.com`. 

For the full list of Amazon SNS endpoints, see the [AWS General Reference](https://docs.aws.amazon.com/general/latest/gr/sns.html).