West US 3
Public cloudWest US 3 is part of Azure public cloud, in Phoenix, United States. It lists 3 availability zones. Its paired region is East US.
Explore West US 3
Latency
Published round-trip measurements from West US 3 to 53 other regions.
VM prices
1,332 Linux and 1,239 Windows VM sizes with pay-as-you-go prices in USD. Compare hourly rates and pricing plans in West US 3.
Compare West US 3 VM pricesIP ranges
181 IPv4 and 44 IPv6 prefixes in AzureCloud.westus3. Inspect or download the regional AzureCloud ranges.
View West US 3 IP rangesRegion facts
- Programmatic name
- westus3
- Location
Phoenix, United States
View on Google Maps- Cloud
- Azure public cloud
- Availability zones
- 3 availability zones
- Paired region
- East US
- Approx. opening year
2021
Reported operational year for this location; individual Azure services can have different launch dates.
- Published residency note
Stored at rest in the United States
Microsoft's datacenter summary. Storage and replication behavior depend on the service and configuration.
Regional planning
Pairing and disaster recovery
West US 3 is paired with East US, but East US is paired with West US. This pairing is one-way.
Both regions are in the United States geography.
Published median round-trip latency from West US 3 to East US: 57 ms.
A region pair does not automatically replicate your application or enable failover. Configure recovery for each service you use.
How Azure region pairing worksAccess and service availability
Available to all customers and partners. Available services, VM sizes, and quota still depend on the region and subscription.
Check products available by regionAvailability zone planning
Zone support varies by service and VM size. Choose zone-redundant or zonal deployments explicitly; selecting West US 3 alone does not distribute a workload across zones.
Check service and zone supportLowest published latency from West US 3
The three lowest measured destinations in Microsoft's P50 (median) round-trip dataset. 30-day measurement window ending . These are Azure backbone measurements; use the browser test for your own connection.
| Destination region | Median round-trip time |
|---|---|
| West US | 19 ms |
| South Central US | 22 ms |
| West Central US | 34 ms |