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IPv4 address length technical design

> Sadiq Saif [mailto:sadiq at asininetech.com] wrote:
> On Wed, Oct 3, 2012 at 12:13 PM, Chris Campbell <chris at ctcampbell.com>
> wrote:
> > Is anyone aware of any historical documentation relating to the choice of 32
> bits for an IPv4 address?
> >
> > Cheers.
> I believe the relevant RFC is RFC 791 - https://tools.ietf.org/html/rfc791

Actually that was preceded by RFC 760, which in turn was a derivative of IEN 123. I believe the answer to the original question is partially available on a series of pages starting at :   http://www.networksorcery.com/enp/default1101.htm 
IEN 2 is likely to be of particular interest ...