Knowledgebase

Reverse DNS (rDNS) maps your server's IP address to a hostname, working in the opposite direction of standard DNS. It is especially important for email servers, as many receiving mail servers use rDNS verification to classify incoming messages. Without a properly configured rDNS record, your emails may be flagged as spam.

Accessing Reverse DNS Management

You can access the Reverse DNS management page through two paths:

Path 1: For the Primary IP (Direct Access)

1. Log in to the Client Area.
2. Go to Services and select the relevant service.
3. In the server dashboard, expand the Network & Security section.
4. Click Reverse DNS.

Path 2: For Any IP (Primary or Additional)

1. Log in to the Client Area.
2. Go to Services and select the relevant service.
3. In the server dashboard, expand the Network & Security section.
4. Click IP Management.
5. In the IP address table, click the three-dot menu ⋯ next to the target IP.
6. Select Reverse DNS from the dropdown.

Step 1: Create a DNS A Record First

Before configuring rDNS, you must create an A record in your domain's DNS panel pointing your desired hostname to your server's IP address. Example:

• Desired hostname: mail.example.com
• Required record: mail.example.com → A → Your Server IP

Configuring Reverse DNS

Once the A record has propagated:

1. On the Reverse DNS page, locate the Hostname field.
2. Enter the full hostname, for example: mail.example.com
3. Click Save.
4. The system will automatically verify that the A record points to your server's IP, then save the rDNS configuration.
5. The Current rDNS value at the top of the page will update immediately after saving.

Updating Reverse DNS

If rDNS is already configured and you want to change it:

1. First, make sure a new A record for the new hostname is already pointing to the same server IP.
2. In the Hostname field, clear the current value and enter the new hostname.
3. Click Save.

Removing Reverse DNS

1. At the top of the page, next to the Current rDNS value, click Remove.
2. Confirm the action in the confirmation dialog.
3. The rDNS record will be deleted immediately. You can reconfigure it at any time.

Common Errors and Solutions

• DNS A Record does not point to hostname IP: The A record is either missing or has not fully propagated yet. Verify the record is correctly configured and wait for propagation to complete, then try again.
• Invalid hostname format: Use only letters, numbers, dots, and hyphens. Example of a valid hostname: mail.example.com
• Hostname is too long: The maximum allowed length is 253 characters as per RFC 1035.
• Reverse DNS is already set to this value: The entered hostname matches the current configuration. No changes are needed.