Originally Posted by rowan

I just re-read this and it makes no sense. It's like you're saying the class is determined by which dotted quad is referenced (?? I can't think of any valid way to describe it)

As per my reply, C classes are all of the 256 IP blocks in the range between 192.0.0.x and 223.255.255.x ... nothing to do with first, second or third dotted quads.

(Of course these days "C class" is often used to refer to a block of 256 IPs anywhere in the IP range, regardless of its real/legacy class...)