---
title: "List IP addresses"
method: GET
path: "/v1/info/ip_addresses"
tags: ["Info"]
---

# List IP addresses

`GET /v1/info/ip_addresses`

Returns a list of IP addresses that you need to allowlist if you're using a firewall or [Custom SMTP](/journeys/channels/email/deliverability/custom-smtp/use-your-smtp-server) provider's IP access management settings to deny access to unknown IP addresses.

These addresses apply to all message types and webhooks, except push notifications.

## Response `200`

Returns an array of IP addresses.

- object
  - `ip_addresses` string[]

## Other responses

- `429` — Your request is over the 10-per-second limit. `Retry-After` tells you how many seconds you must wait before you send the next request.

## Changes

- **2026-09-02** `5da2740beeb5` — 1 info
  - added the media type `application/json` for the response with the status `429`

[Change history](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/changes/v1/info/ip_addresses/get.md)

---

[API](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference.md) · [All operations](https://skmtc.dev/customer/apis/customer-io-journeys-api-reference/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/customer/customer-io-journeys-api-reference/revisions/5da2740beeb5/schema)