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How to configure reverse DNS of an Instance

Reviewed on 03 March 2025 • Published on 26 May 2021

Reverse DNS is the opposite of classic “forward” DNS and maps an IP address to a hostname. This can be useful if, for example, you want to send emails from your server.

Important

Using the default reverse DNS (*.pub.instances.scw.cloud) may lead to issues with the deliverability of your emails and subscription to tools like Junk Mail Reporting Program (JMRP) and Smart Network Data Services, Microsoft services to whitelist your IP’s on their email servers.

Before you startLink to this anchor

To complete the actions presented below, you must have:

A Scaleway account logged into the console
Owner status or IAM permissions allowing you to perform actions in the intended Organization
An Instance with its public (flexible) IP address attached to it
Configured a matching A-record pointing to your IP address. Note that if you have created the A record recently, it may take up to 24 hours for the operation to be completed.

How to set up a reverse DNS recordLink to this anchor

Click Instances in the Compute section of the side menu. The Instances page displays.
Click the Flexible IPs tab.
Click the «See more Icon» icon next to the IP address you wish to configure reverse DNS for and select Edit reverse from the drop-down menu.
Enter the reverse DNS you want to associate with the IP address. Generally this corresponds to your hostname.
Click Edit reverse to finish.
Note
Once the reverse DNS has been updated, it may take up to 24 hours before it is fully propagated.

Tip

You cannot set reverse DNS for individual addresses within a flexible IPv6 /64 block via the Scaleway console. See our dedicated documentation on how to use the IPAM API for this purpose.