On Thu, Mar 11, 2021, 15:12 Jan Schaumann <jschauma@netmeister.org> wrote:
"Nelson H. F. Beebe" <beebe@math.utah.edu> wrote:
> 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 earliest copy of the hosts file I could find was
http://pdp-10.trailing-edge.com/tops20_v6_1_tcpip_installation_tp_ft6/06/new-system/hosts.txt

;GIDNEY::<PAETZOLD.ARPANET>HOSTS.TXT.5, 27-Mar-85 13:11:54, Edit by PAETZOLD
;GIDNEY::<PAETZOLD.ARPANET>HOSTS.TXT.4, 25-Mar-85 13:56:55, Edit by PAETZOLD
;local stuff

; DoD Internet Host Table
;  22-Mar-85
;  Version number 436

Does anybody have an earlier copy?

-Jan

This was in the first page of Google search results for "DoD Internet Host Table"; I bet with a little more research I could come up with something much older.  Or one of the PDP-10 folks will find the original...

https://emaillab.jp/dns/hosts/

-Henry