Host ID-to-host name mappings are not case-sensitive
The host ID-to-host name mappings are not case-sensitive and are always displayed in a lower case irrespective of the capitalization that you have used while adding the mappings.
Mappings are displayed in the NetBackup Administration Console in the Mapped Host Names / IP Addresses column on the NetBackup Management > Host Properties > Clients > Clients tab. They can also be listed using the nbhostmgmt command.