(1) In TCP/IP, that part of the internet address that defines the host on the network. The length of the host ID depends on the type of network class (A, B, or C).
(2) A numeric identifier assigned to a group of host fibre-channel ports for the purpose of logical unit number (LUN) mapping. For each host ID, there is a separate mapping of Small Computer System Interface (SCSI) IDs to virtual disks (VDisks).