What Reverse DNS is and what it is used for
Reverse DNS allows you to look up the hostname (FQDN, Fully Qualified Domain Name) associated with a public IP address using a PTR DNS record. This configuration is particularly useful for email servers, as it can help verify the identity of the sending server and improve the reliability of email communications.
Adding a hostname to Reverse DNS
Reverse DNS configuration is not available for public IP addresses associated with Cloud VPS instances.
You can configure Reverse DNS for a public IP address whether its status is
ACTIVE or
INACTIVE.
To add a hostname to the Reverse DNS configuration of a public IP address:
- access the details page of the public IP address;
- select the Edit (Manage Reverse) tab;
- in the Reverse DNS section, select Add hostname;
- in the Hostname 1 field, enter the fully qualified domain name (FQDN);
- to add more hostnames, select Add hostname again and complete the corresponding fields;
- select SAVE CHANGES;
- in the Confirmation window, select CONFIRM CHANGES.
Reverse DNS changes are applied immediately, but DNS propagation may take up to 48 hours.
Modifying or deleting a hostname from Reverse DNS
To modify or delete a hostname associated with Reverse DNS:
- access the details page of the public IP address;
- select the Edit (Manage Reverse) tab;
- in the Reverse DNS section:
- to modify a hostname, update the domain name in the corresponding field;
- to delete a hostname, select the corresponding DELETE button.
- select SAVE CHANGES;
- in the Confirmation window, select CONFIRM CHANGES.
Reverse DNS changes are applied immediately, but DNS propagation may take up to 48 hours.