The Manager primary contact has the option to automatically set the tracking method to DNS for hosts when a valid DNS hostname is detected. This applies only when scans are launched by DNS hostname.
Note: If the subscription has Scan By Hostname ADDON enabled, then the DNS Tracking setup gets enabled for the user by default.
If you have not opted for the Scan By Hostname ADDON, then follow the below steps to enable the DNS tracking manually.
1) The Manager primary contact can go to Scans > Setup > DNS Tracking.
2) Select the option Enable DNS Tracking for hosts and click Save.
Note: There is another option to track all assets by DNS if valid hostnames are found. This option is available only for Admin. Once Admin enables it, all the assets will be tracked by DNS when valid hostname is detected irrespective of whether the scan is launched by DNS or IP.