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Managing reverse DNS records for your server

  • Applies to: All DV, Grid

  • Difficulty: Easy

  • Time needed: 10 minutes

  • Tools needed: None

 
  • Applies to: Grid
    • Difficulty: Easy
    • Time Needed: 10
    • Tools Required: None
  • Applies to: All DV
    • Difficulty: Easy
    • Time Needed: 10
    • Tools Required: None

Overview

Because of the shared nature of the Grid, the reverse DNS record for the server is already set. It will come up as something similar to abcdefg.gs0x.gridserver.com. This is normal and is correct to match the host name of your server.

Your server has a default reverse DNS record set up which points to the primary domain of your service. If you change your primary domain or wish to have a different domain for your reverse DNS, you may use the Reverse DNS tool in your AccountCenter. The terms PTR Record and Reverse DNS Entry are interchangeable.

  • If you have multiple IP addresses on your DV, you will be able to set a different reverse DNS record for each one.

Correct reverse DNS entries

CAUTION:

If your reverse DNS record does not match the host name of the server, or if the domain given in the reverse DNS record does not resolve back to that IP, you may have difficulty sending or receiving mail on your DV server. Follow the Important for configuration section below for further assistance.

Important for configuration

  • Make sure that your reverse DNS record matches the host name of your server.
  • Make sure that a regular DNS lookup for the domain you have designated as the reverse DNS record entry returns the IP address in question. For example:
    • If 70.32.86.172 has a reverse DNS record of example.com
    • example.com should resolve to 70.32.86.172

Do I need to have my reverse DNS record match the domain I'm using to send email?

No. You can send email from username@another_example.com from the example.com server without any problem. As long as you've verified the two steps in the previous section, you will be able to send mail without reverse DNS difficulties.

Editing reverse DNS records

  1. Log into your AccountCenter.
  2. From the Overview page, click the AC-dash-buttons 55.gif icon to the right of your DV.
  3. Select Reverse DNS, located under the DNS Zone File section.
    1568_01
  4. On the next page, you will see the IP address(es) associated with your server. Select the domain name you want to use from the drop-down menu and hit save:
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  5. You will see a confirmation on the same page after hitting save:
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Changes will take approximately 24-72 hours to propagate. You can check the reverse DNS of any IP address by using the following command (on your server or if you are on a Mac, Terminal.app will also work):

host xxx.xxx.xxx.xxx

Where xxx.xxx.xxx.xxx is the IP address you want to check the PTR record for; an example output of this command is:

$ host 64.13.229.37
37.229.13.64.in-addr.arpa domain name pointer current.example.com.

You can also verify the currently propagated reverse DNS (or PTR) record for your IP address by using this free third-party service: My IP Test.

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