in ODOC

ODOC: hostid

hostid – Print the numeric id for the host.

Summary:

It will print a 32-bit hexadecimal numerical identifier for the host machine. Certain product registration procedures use this number to brand a particular user license. The 32-bit quantity happens to be closely related to the system’s IP address, but that isn’t always the case.

If your IP address is 192.168.14.155 then your hostid is A8C09B0E.

A8 — 168
C0 — 192
9B — 155
0E — 14

Example:

$ hostid — Print the hostid of the current host.

Read: man hostid
hostid, network, odoc, linux, gnu/linux