Headers -> Host Name: how to populate the section?

Hello, I've inherited a configuration with the Host Names configured in the section: Application Security -> Header -> Host Names The version I'm using is 11.3.

Actually in the configuration there are: - Private IP; - public IP; - FQDN - reverse; The configuration doesn't include Sub-domains.

Could you please suggest me the guide line to configure this section? In particular I need to know how to populate this section. Are these items populated after an assesment? In which case is the reverse DNS needful?

thanks a lot

Robert