> For the complete documentation index, see [llms.txt](https://docs.txn.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.txn.io/api-basics/webhooks/source-ip-addresses.md).

# 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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