A Comprehensive Guide: Setting Up Reverse DNS PTR Record on CentOS

Step 1: Access Your DNS Server Configuration
Ensure you have access to your DNS server configuration, which is often managed by your hosting provider or through a control panel like cPanel or Plesk.

Step 2: Locate the IP Address
Identify the IP address you want to associate with a domain name. This is the IP address of your CentOS server.

Step 3: Create  a PTR Record
Open the DNS configuration file on your server. In CentOS, this is typically located at /etc/named.conf or /etc/bind/named.conf.
Locate the zone configuration for your domain and add a PTR record. For example:
1.0.0.127.in-addr.arpa. IN PTR example.com.
Ensure the IP address is in reverse order and ends with in-addr.arpa.

Step 4: Restart DNS Service
After making changes, restart the DNS service to apply the new configuration:
#systemctl restart named # For CentOS 7 and later

Step 5: Verify Configuration
Use online tools like MXToolbox to verify that your PTR record is correctly configured.