Step 1: Login to your DNS server and start DNS control panel at Start > Programs > Administrative Tools – DNS
Step 2: Expand Reverse Lookup Zones and click the IP segment that your will setup
Step 3: Create New PTR, You can Right Click IP segment -> New Pointer(PTR).
Step 4: Set the correct parameters for PTR
Host Ip Number: Please input correct IP
Host Name: Server Host Name + domain name eg. CP1001.databasemart.net