Before getting started with setting up reverse DNS within your Dyn account, contact your IP provider and confirm that they allow delegation of your reverse DNS zone. If they do not allow delegation, typically they can host your pointer record (PTR) for you and no reverse DNS configurations are required within your Dyn account. If they do allow delegation, confirm the exact syntax of the reverse DNS hostname with them as some providers use slashes and some use dashes. Additionally, if you are delegating a reverse DNS zone, confirm that this zone matches exactly what you configure in your Dyn account as this is necessary in order for delegation to work properly.
Once your reverse zones are created, your PTR records are created, and these changes are published, you can then proceed with having your IP provider update your reverse DNS zone delegation. Please note that no delegation changes are required with your registrar with a reverse DNS
Setting up a reverse DNS zone is slightly different for the two types of IP address blocks. Use the following procedures to successfully setup a reverse DNS zone for your IP address block type.
Setting Up Reverse DNS – Classless Address Block (Partial Range of IP Addresses)
Finding Your Reverse DNS Zone Name
Creating Your DNS Zone
Adding a Node For Each IP Address
Creating a PTR For Each Host Address
Publishing Your Zone
Updating Your Zone Delegation
Adding CNAME Records For Each Host At Your ISP