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

# Firewall & Network Configuration

> Plivo IP ranges to whitelist on your firewall for messaging API callbacks

<Info title="TL;DR">
  * **What:** Plivo's callback NAT gateway IP addresses to whitelist on your firewall so messaging webhooks (delivery reports, inbound messages) can reach your servers
  * **Direction:** Outbound (Plivo → your servers). You whitelist Plivo's IPs on your firewall
  * **Regions:** Ashburn (Virginia) and San Jose (California)
  * **Note:** This page is about allowing Plivo messaging callback traffic through your firewall. To restrict which IPs can call Plivo's API, see [API Access Control](/account/concepts/ip-whitelisting/). For voice SIP/RTP/callback IPs, see [Voice: Firewall & Network Configuration](/voice/concepts/firewall-network-configuration/)
</Info>

To ensure that your communication infrastructure doesn't block communication with Plivo, we encourage you to whitelist these IP address ranges for Messaging API.

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## Callbacks from Plivo

Some Plivo APIs elements support callback events. To make sure those callbacks are not blocked, allow traffic from these Plivo IP addresses to your web applications.

These IP addresses are NAT gateway IPs associated with our HTTP(s) OutProxy instance.

<table>
  <tbody>
    <tr>
      <td>Regions</td>
      <td>IP Addresses</td>
    </tr>

    <tr>
      <td>Ashburn, Virginia, USA</td>
      <td>18.211.55.148/32<br />18.211.27.222/32</td>
    </tr>

    <tr>
      <td>San Jose, California, USA</td>
      <td>13.56.175.187/32<br />13.57.139.231/32</td>
    </tr>
  </tbody>
</table>

***

## Related

* [API Access Control (IP Whitelisting)](/account/concepts/ip-whitelisting/) — Restrict which IPs can make API requests to your Plivo account
* [Voice: Firewall & Network Configuration](/voice/concepts/firewall-network-configuration/) — Plivo IP ranges and ports for SIP signaling, RTP media, and voice callbacks