From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
NAME
hostid - print the numeric identifier of the current host
SYNOPSIS
/usr/ucb/hostid
DESCRIPTION
The hostid command prints the identifier of the current host in hexadecimal. This numeric value is likely to differ when hostid is run on a different machine.
SEE ALSO
gethostid(2)
sysinfo(2) in the Programmer'sReferenceManual.