<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><br><br>Sent from my iPhone</div><div><br>On Dec 17, 2018, at 9:36 PM, Joe <<a href="mailto:jbfixurpc@gmail.com">jbfixurpc@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div>Recently, I was made aware that a class "A" was indeed a /8 and a class "B" was actually a /12 (172.16/<a href="http://172.31.255.255">172.31.255.255</a>) while a class "C" is actually a /16. <br></div></blockquote><br><div>You had it right to start with.</div><div><br></div><div>A is (was) /8, B is /16, C is /24 </div><div><br></div><div>All on human easily readable byte boundaries in IPv4 space.</div><div><br></div><div>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.</div><div><br></div><div>Anyone who networked before and during the CIDR transition won't forget this...</div><div><br></div><div><br></div><div>-george </div></body></html>