# Hosts File IP Addresses

## Notice

> These IP addresses are up to date as of **August, 2025**. But are liable to change. It is important that these IPs are used only for testing communication errors, and that DNS resolution failures are actually resolved. These IPs are liable to change in the future, particularly due to load balancing.
> 
> Note that deprecated domain names/services, such as Amazon Cognito are not provided.

# Domain ↔︎ IP Addresses: Hosts File Format

For an up to date list of required domains, please see [https://support.jira.cybercrucible.com/servicedesk/customer/portal/1/article/34603009](https://support.jira.cybercrucible.com/servicedesk/customer/portal/1/article/34603009)

The following IPs are required by the **Cyber Crucible Agent** for endpoints' connectivity.

`151.181.219.152 agent.oauth.rpp.cybercrucible.com`  
`151.181.219.153 agent.tasking.rpp.cybercrucible.com`  
`34.210.57.13    installerfiles.rpp.cybercrucible.com `