# Reserve a floating IP
Source: https://docs.infraista.com/en/networking/floating-ips/reserve-a-floating-ip



Reserve a floating IP when you need an address that stays the same while the servers behind it
change.

**Before you start:** you need a role that can manage floating IPs (Owner, Admin or Developer by
default), and a payment method on the organization.

## Reserve the address [#reserve-the-address]

1. Go to **Network & Library › Floating IPs** and select **Reserve IP**.
2. Choose the **IP version**:
   * **IPv4**: works everywhere, the most common choice;
   * **IPv6**: for IPv6-ready apps and networks.
3. Pick the **Network zone**. The address can only be used by servers in the same zone.
4. Enter a **Name**.
5. Under **Attach to server**, pick a server, or **Don't attach yet**. Only servers in that zone with
   a primary IP of the same type are listed.
6. Optionally pick a **Project** so the cost shows under it.
7. Check the price in the summary and select **Reserve IP**.

<Shot name="networking/floating-ips/reserve" alt="The Reserve a floating IP dialog with IP version, network zone, name, attach to server and project" />

## Check that it worked [#check-that-it-worked]

The new address appears in the list with its server under **Attached to**, or **Not attached**.

## Start using the address on the server [#start-using-the-address-on-the-server]

When the address is attached to a server you created in Infraista, its page shows **Start using this
address**:

1. Restart the server once, so its network settings include the address.

2. Or add the address inside the server, for example on Linux:

   ```bash
   ip addr add 203.0.113.100/32 dev eth0
   ```

3. To keep it after a reboot, add it to the server's network configuration (netplan,
   `/etc/network/interfaces` or NetworkManager).

## Related [#related]

* [Move a floating IP](/en/networking/floating-ips/move-a-floating-ip)
* [Set reverse DNS](/en/networking/floating-ips/set-reverse-dns)