The format of the host table binary file is:

word 0	SIXBIT /HOSTS1/
word 1	SIXBIT /HOSTS/
word 2	version HOSTS file which this was compiled from.
word 3	user name of person who compiled this generation of the host table
word 4	Date of compilation as sixbit YYMMDD
word 5	Time of compilation as sixbit HHMMSS
word 6	Address in file of NAME table.
word 7	Address in file of NUMBER table.

NUMBERS table:
word 0	Number of entries in this table.
word 1	Number of words per entry (currently 3).
followed by entries, in order by host number.

Each entry looks like this:
word 0	host number
word 1	LH  pointer to system name (ITS, TIP, TENEX, etc.)
	May be 0 → not known.
word 1  RH  pointer to official name of host.
word 2  LH  flags:
	4.9 1 → server site.
word 2  RH  pointer to machine name (PDP10, etc).
	May be 0 → not known.


NAMES table:
word 0	Number of entries
followed by one word entries, sorted by the host name treated as a vector of
signed integers, looking like:

word 0	LH  address in file of NUMBERS table entry for this host.
	RH  pointer to host name

Host, system and machine names are ASCIZ strings, all letters upper case.
The strings are stored before, after and between the NAME and NUMBER tables.