> ## Documentation Index
> Fetch the complete documentation index at: /docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Arize AX Data Regions

> Arize AX regions and the hostnames for each: United States, European Union, and Canada.

Arize AX runs in the United States, the European Union, and Canada. Your account is provisioned in one of these regions and its data stays there, which lets you meet data residency requirements by choosing where Arize stores your traces. Use the hosts for your region when you send data, call the API, or sign in. The sign-in page has a region selector.

| Service | United States | European Union | Canada |
| - | - | - | - |
| App (UI) | `app.arize.com` | `app.eu-west-1a.arize.com` | `app.ca-central-1a.arize.com` |
| OTLP traces (HTTP) | `https://otlp.arize.com/v1` | `https://otlp.eu-west-1a.arize.com/v1` | `https://otlp.ca-central-1a.arize.com/v1` |
| OTLP traces (gRPC) | `https://otlp.arize.com` | `https://otlp.eu-west-1a.arize.com` | `https://otlp.ca-central-1a.arize.com` |
| SDK ingestion | `api.arize.com` | `api.eu-west-1a.arize.com` | `api.ca-central-1a.arize.com` |
| Flight imports and exports | `flight.arize.com` | `flight.eu-west-1a.arize.com` | `flight.ca-central-1a.arize.com` |
| Outbound calls from Arize | `cloud.arize.com` | `cloud.eu-west-1a.arize.com` | `cloud.ca-central-1a.arize.com` |

If your network filters traffic, see [IP Whitelisting](/docs/ax/security-and-settings/whitelisting.md) for what each host is used for.