How to Setup Reverse DNS in WHM

Create a reverse DNS zone file

1. Login to WHM and navigate to DNS Functions -> Add a DNS Zone
2. Type in your IP address (example – 192.168.254.254)
3. Enter the reverse DNS name (example -254.128.192.in-addr.arpa).
   

Edit the reverse DNS zone file
Now, you will need to create each PTR record.

1. From the main WHM page, go to DNS Functions-> Edit DNS Zone
2. Under where it says “Add New Entries Below This Line”, enter the corresponding octet or nibble (the final number in the IP address). Example: 254. In the drop down menu, select “PTR”.
3. Enter the associated domain name for that IP address
4. Repeat for each IP address

To check that your reverse DNS is working, you can type this from the command line:
host 192.168.254.254
and the output should look like this:
254.254.168.192.in-addr.arpa domain name pointer www.yourdomain.com