Sent from my iPhone
> On Dec 17, 2018, at 9:36 PM, Joe <jbfixu...@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
