# Advertise BYOIP

## Prerequisites

* Use BYOIP if you need to retain existing IPs, reputation, or configuration.
* Please [pre-register ROA/RPKI with your RIR](/welcome/elastic-compute/get-started/manage-networking/advertise-byoip/register-roa-rpki-with-rir.md) to enable BYOIP.
* Please [register the corresponding route object](/welcome/elastic-compute/get-started/manage-networking/advertise-byoip/register-a-route-object-in-the-irr.md) in IRR in advance.
* Access to this feature is restricted. Please contact us to request activation.

## Procedures

1. Go to **Elastic Compute** > **IP Pool** > **CIDR Block** and click **+ BYOIP**.<br>

   <div align="left" data-with-frame="true"><figure><img src="/files/stp9c9lRr53nb28LX621" alt=""><figcaption></figcaption></figure></div>
2. Advertise your IP prefixes.
3. Allocate to a resource group if you need.
4. Check and confirm your order.

## Result

Zenlayer will validate your RPKI/ROA and the corresponding route object before activating BYOIP.


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