# Source IP addresses

If your webhook endpoint is behind a firewall or NAT, allow inbound traffic from the IP addresses listed below.

{% hint style="info" %}
These IP addresses may change due to platform maintenance, upgrades, or vendor outage mitigation.
{% endhint %}

## Sandbox

Webhook messages for the API URL `https://api.sandbox.txn.io` are sent from the following IP addresses:

```
52.215.16.239
54.216.8.72
63.33.109.123
2a05:d028:17:8000::/52
```

## Production

Webhook messages for the API URL `https://api.txn.io` are sent from the following IP addresses:

```
44.228.126.217
50.112.21.217
52.24.126.164
54.148.139.208
2600:1f24:64:8000::/52
```


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.txn.io/api-basics/webhooks/source-ip-addresses.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.