How to set up reverse DNS zone and PTR records

As a preventative measure against bulking during email delivery, it is critical to ensure that reverse DNS and PTR records are setup and properly configured. The most common reason for establishing a reverse DNS record is to add credibility to the email server sending outbound mail. Reverse DNS adds further tracing to the origin of an e-mail and some incoming mail servers will not accept mail from IPs without a reverse DNS. This article details how to setup a proper reverse DNS zone, as well as create a PTR record, to improve email delivery.

To create the reverse DNS zone:

You must create the reverse DNS zone of the authoritative DNS nameserver for the main IP address of your server. To do so, perform the following:

  1. Enter the IP address you're trying to configure into the DIG Web Interface Tool

    Note: If the Reverse response is not provided by your nameserver, you’ll need to contact your ESP to help you set a PTR record. Email their support team and let them know you would like a PTR record set for the IP address X.X.X.X resolving to

  2. If you control the authoritative nameserver, first create a DNS zone in the specific format.

    EX: If your IP address is, start by dropping the final octet (last set of numbers) to give you 192.168.0. Then reverse the fragment of the IP address, giving you: 0.168.192.

    Note: Hostname format should start with a portion of your IP address written backward followed by

  3. Append in: 

    EX: Complete reverse zone domain of:

To create the PTR Record: 

  1. Add a new PTR record. For the name, enter the final digit of the IP address that you’re setting up the reverse record for.

    EX: 100

  2. For the Canonical Hostname, enter the domain you’d like the IP address to resolve


  3. After you've saved your file zone, allow time for the change before validating the new reverse DNS record.

    Note: If configured properly, you should see something similar to the following next time you run the DIG Web Interface Tool:   IN PTR




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