[ih] The netmask

[Andrew G. Malis]

John,

Thanks, I had forgotten it was Phil!

Cheers,
Andy


On Wed, Jan 8, 2025 at 5:22 PM John Gilmore <gnu at toad.com> wrote:

> Andrew G. Malis via Internet-history <internet-history at elists.isoc.org>
> wrote:
> > people realized that since CIDR bit-masks were always all ones from
> > the left and all zeros from the right, they could be equivalently
> > represented by an integer count of one bits, usually following a "/"
> > character
>
> The Wikipedia page on CIDR says that Phil Karn invented the CIDR
> "/bitcount" notation in the 1980s, citing two NANOG messages from 2018
> with the remembrances of Brian Kantor and Bill Simpson:
>
>   https://seclists.org/nanog/2018/Dec/334
>   https://seclists.org/nanog/2018/Dec/368
>
>
> https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#CIDR_notation
>
> There's more CIDR history in that NANOG thread, though this week's
> thread has covered a lot of it.
>
>         John
>
>