Stupid Question maybe?

Tue Dec 18 13:32:13 UTC 2018

Sent from my iPhone

> On Dec 17, 2018, at 9:36 PM, Joe <jbfixurpc at 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 
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