# Test environment for Android devices
<a name="custom-test-environments-hosts-android"></a>

AWS Device Farm utilizes Amazon Elastic Compute Cloud (EC2) host machines running Amazon Linux 2 to execute Android tests. When you schedule a test run, Device Farm allocates a dedicated host for each device to independently run tests. The host machines terminate after the test run along with any generated artifacts. 

The Amazon Linux 2 host provides several advantages: 
+ **Faster, more reliable testing**: Compared to the legacy host, the new test host significantly improves test speed, especially reducing test start times. The Amazon Linux 2 host also demonstrates greater stability and reliability during testing.
+ **Enhanced Remote Access for manual testing**: Upgrades to the latest test host and improvements lead to lower latency and better video performance for Android manual testing. 
+ **Standard software version selection**: Device Farm now standardizes major programming language support on the test host as well as Appium framework versions. For supported languages (currently Java, Python, Node.js, and Ruby) and Appium, the new test host provides long-term stable releases soon after launch. Centralized version management through the `devicefarm-cli` tool enables test spec file development with a consistent experience across frameworks. 

**Topics**
+ [Supported IP ranges for the Amazon Linux 2 test environment in Device Farm](amazon-linux-2-ip-ranges.md)

# Supported IP ranges for the Amazon Linux 2 test environment in Device Farm
<a name="amazon-linux-2-ip-ranges"></a>

Customers often need to know the IP range from which Device Farm's traffic originates, particularly for configuring their firewalls and security settings. For Amazon EC2 test hosts, the IP range encompasses the entire `us-west-2` region. For Amazon Linux 2 test hosts, which is the default option for new Android runs, the ranges have been restricted. The traffic now originates from a specific set of NAT gateways, restricting the IP range to the following addresses:


****  

| IP Ranges | 
| --- | 
|  **44.236.137.143**  | 
|  **52.13.151.244**  | 
|  **52.35.189.191**  | 
|  **54.201.250.26**  | 

For more information about Android test environments in Device Farm, see [Test environment for Android devices](custom-test-environments-hosts-android.md).