[TUHS] [COFF] Pondering the hosts file

Nelson H. F. Beebe beebe at math.utah.edu
Fri Mar 12 04:21:38 AEST 2021


The hosts file format definition appears in

	RFC 752: Universal host table
	RFC 810: DoD Internet host table specification
	RFC 952: DoD Internet host table specification

A 1986 hosts.txt file in my PDP-10 archives notes:

; The format for entries is:
;
; NET : NET-ADDR : NETNAME :
; GATEWAY : ADDR, ADDR : NAME : CPUTYPE : OPSYS : PROTOCOLS :
; HOST : ADDR, ALTERNATE-ADDR (if any): HOSTNAME,NICKNAME : CPUTYPE :
;   OPSYS : PROTOCOLS :
;
; Where:
;;  ADDR = internet address in decimal, e.g., 26.0.0.73
;;  CPUTYPE = machine type (PDP-11/70, VAX-11/780, FOONLY-F3, C/30, etc.)
;;  OPSYS = operating system (UNIX, TOPS20, TENEX, ITS, etc.)
;;  PROTOCOLS = transport/service (TCP/TELNET,TCP/FTP, etc.)
;;  : (colon) = field delimiter
;;  :: (2 colons) = null field

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