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Configure reverse DNS

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How to configure reverse DNS of an Instance

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.


If you are using the default reverse DNS (*.pub.instances.scw.cloud), you may experience problems with deliverability of your emails and during the subscription of certain tools like Junk Mail Reporting Program (JMRP) and Smart Network Data Services (SNDS) - services provided by Microsoft to whitelist your IP’s on their email servers.

  • You have an account and are logged into console.scaleway.com
  • You have created an Instance and have not detached its public (flexible) IP address
  • You have 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 record

  1. Click Instances in the Compute section of the side menu. The Instances page displays.
  2. Click the Flexible IPs tab.
  3. Click «See more Icon» next to the IP address you wish to configure reverse DNS for, and select Edit Reverse from the drop-down menu.
  4. Enter the reverse DNS you want to associate with the IP address. Generally this corresponds to your hostname.
  5. Click Edit this reverse to finish.

    Once the reverse DNS has been updated, it may take up to 24 hours before it is fully propagated.

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