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

# IP addresses

> env zero IP addresses across us-east-1 and us-west-2 for allowlisting in VCS providers and cloud resources, with a Terraform provider for dynamic IP lookups.

Use these IP addresses to configure your [VCS](https://docs.envzero.com/guides/admin-guide/manage-vcs.md) allowed IP list or firewall rules for cloud resources. env zero calls your services through these addresses. They are also used for SaaS runners.

Prioritize the us-east-1 addresses. env zero uses us-west-2 only during a failover event.

| Availability zone | IP addresses |
| :- | :- |
| us-east-1a | 18.214.210.123, 44.195.170.230 |
| us-east-1b | 44.212.144.113, 52.73.227.111 |
| us-east-1c | 3.222.51.117, 3.226.24.146 |
| us-east-1d | 3.209.36.240, 54.165.19.49 |
| us-east-1e | 44.205.134.220 |
| us-east-1f | 18.214.49.142, 54.88.50.2 |
| us-west-2a | 35.81.146.242, 54.68.137.240 |
| us-west-2b | 44.228.227.2, 44.240.181.100 |
| us-west-2c | 35.85.88.233, 54.149.16.114 |
| us-west-2d | 44.227.16.37 |

You can also use the [env zero Terraform provider](https://registry.terraform.io/providers/env0/env0/latest/docs/data-sources/ip_ranges) to fetch IP addresses dynamically.


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