How to add a PTR record in Plesk?
If DNS server installed with Plesk is used, here are the steps to add a new DNS record to the zone:
Go to Plesk > Domains > example.com > DNS Settings.
Click Add Record.
Select Record type as PTR and fill in the required informaion.
Click OK and then click Update.
Note: Plesk supports creating PTR records with the following subnet masks: 8, 16, 24.
General documentation about DNS management in Plesk can be found here: Plesk Administrators Guide.
For more details on PTR records and its format check the following link http://help.dnsmadeeasy.com/managed-dns/dns-record-types/ptr-record/