---
title: "Attach a reserved IP as an Add-on IP"
description: "Give a node or a firewall a second public IPv4 address from your reserved IPs while it keeps its own, and detach it again."
content_type: "how-to"
product: "reserved-ip"
platform: "MyAccount"
url: "/myaccount/reserved-ip/how-to/attach-a-reserved-ip-as-an-add-on-ip/"
topic: ["attach"]
relationships: {"requires":["/myaccount/reserved-ip/how-to/reserve-an-ip/"]}
---

# Attach a reserved IP as an Add-on IP

An Add-on IP is a reserved IP attached to a node or a firewall as a second public address. The
resource keeps its own public IP, and you can take the add-on away again without touching the
original.

## Before you begin

- A reserved IP with the status **Available**. See
  [Reserve an IP](/myaccount/reserved-ip/how-to/reserve-an-ip/) if you do not have one yet.
- A node or a firewall to attach it to. A node must be unlocked.

## Attach the IP

1. Open **Network > Reserve IP**.
2. Open the address's **Actions** menu and choose **Attach IP**.
3. Select **Node** or **Firewall**, pick the resource, and click **Attach IP**.

The status changes to **Attached**, and the resource's name appears under **Assigned To**. On a
node, the address is listed on the **Network** tab with the node's add-on IPv4 addresses. The
node answers on it straight away, with nothing to set up inside the node: `ip addr` on a
Linux node shows it next to the node's own public IP.

A resource can hold several Add-on IPs; repeat the steps with another reserved IP to add one.

## Detach the IP

1. Open **Network > Reserve IP**.
2. Open the address's **Actions** menu and choose **Detach IP**.
3. In **Detach Reserve IP**, click **Detach IP**.

The address leaves the node, and its status goes back to **Available**. It stays reserved to
your account, ready to attach somewhere else.

If **Attach IP** stays greyed out after you pick a node, the node and the address are on
different networks; [The IP will not attach](/myaccount/reserved-ip/troubleshooting/reserved-ip/#the-ip-will-not-attach-to-a-node)
has the way round it. To use the address as the node's main public IP instead, see
[Attach a reserved IP to a node](/myaccount/node/how-to/attach-a-reserved-ip/).