# Share resources across Availability Zones in Amazon Transit Gateway
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To ensure that resources are distributed across the Availability Zones for a Region, Amazon Transit Gateway independently map s Availability Zones to names for each account. This could lead to Availability Zone naming differences across accounts. For example, the Availability Zone `us-east-1a` for your Amazon account might not have the same location as `us-east-1a` for another Amazon account.

To identify the location of your multicast domain relative to your accounts, you must use the *Availability Zone ID* (AZ ID). The AZ ID is a unique and consistent identifier for an Availability Zone across all Amazon accounts. For example, `use1-az1` is an AZ ID for the `us-east-1` Region and it is the same location in every Amazon account.

**To view the AZ IDs for the Availability Zones in your account**

1. Open the Amazon RAM console at [https://console.amazonaws.cn/ram/home](https://console.amazonaws.cn/ram/home).

1. The AZ IDs for the current Region are displayed in the **Your AZ ID** panel on the right-hand side of the screen.