Re: Stupid Question maybe?

[George William Herbert <george.herbert () gmail com>]

Sent from my iPhone

> On Dec 17, 2018, at 9:36 PM, Joe <jbfixurpc () gmail com> wrote:
>
> Recently, I was made aware that a class "A" was indeed a /8 and a class "B" was actually a /12 
> (172.16/172.31.255.255) while a class "C" is actually a /16. 

You had it right to start with.

A is (was)  /8, B is /16, C is /24 

All on human easily readable byte boundaries in IPv4 space.

The RFC-1918 internal space was allocated from a /8, a /12, and a /16 sized block.  Those aren't A, B, or C network 
sizes.  Whoever corrected you is confused.

Anyone who networked before and during the CIDR transition won't forget this...


-george