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

# Outbound IP Addresses

> PCI Booking's outbound IP addresses, for whitelisting with third parties (PSPs, channel managers, hotel PMSs).

When PCI Booking makes an outbound call on your behalf - processing a payment through a PSP, relaying a request to a third party, or forwarding data to your own API - the request originates from PCI Booking's infrastructure. Some third parties require these addresses to be whitelisted before they'll accept traffic; without it, you'll typically see a 401, 403, or a generic "not allowed from there" style rejection at the third party.

## Current IP Addresses

```text theme={null}
54.76.6.44
54.154.67.24
34.243.40.177
52.212.21.4
```

<Warning>
  This is the current list of IP addresses PCI Booking uses for outbound calls. This list **may change** - contact [support@pcibooking.net](mailto:support@pcibooking.net) to confirm the current list before relying on it for a whitelist configuration, especially for a production integration.
</Warning>

## When You Need This

* Configuring a PSP's firewall/whitelist so PCI Booking can reach their API through the [Universal Payment Gateway](/use-tokens/universal-payment-gateway).
* Setting up [Token Replacement in Response](/use-tokens/token-replacement-in-response) or [Tokenization on Request](/capture-cards/tokenization-on-request), where PCI Booking relays requests to your own API and third parties may whitelist PCI Booking as the caller.
* Any third-party integration that rejects requests until PCI Booking's origin is explicitly allowed.

## Related

* [Universal Payment Gateway](/use-tokens/universal-payment-gateway). Process payments through 100+ PSPs.
* [Token Replacement in Response](/use-tokens/token-replacement-in-response). Extract card data from third-party responses.
* [Tokenization on Request](/capture-cards/tokenization-on-request). Intercept inbound requests containing card data.