On x64 systems, the Host ID is only created when you configure and use the preinstalled Solaris OS (on the HDD shipped with the system). When you boot the system for the first time, the Solaris OS will randomly generate a unique Host ID. This Host ID is for use with the software license. If you do not use the preinstalled Solaris OS, then there is no need for the Host ID. Because the Host ID is randomly generated during the initial boot, it is not provided on the CIS sheet that is shipped with your system.