Host ID

A Host ID refers to a part of a TCP/IP address that identifies the specific address of a host on a subnet or part of a network.

When the netmask is setup, it is a number where some of the most significant bits have a 1's value and the rest have values of 0. The most significant part of the netmask with bits set to 1's specifies the network address, and the lower part of the address will specify the host address.

The least significant digits of the IP address that matches the part of the netmask where the bits are set to zeros determines the host ID.