To create a master list of hosts, you must have permissions to all host groups. If you need to generate a report, and you want the report scope to include specific hosts, but you can’t remember the precise name of each client, you can generate a master list of all clients to jog your memory. For example, perhaps your production hosts and test hosts are not organized into specific host groups; rather they are spread throughout host groups. With a list, you can identify a production host or test host by name.