In IPv4 spec Class A is 1-126.H.H.H, class B is 128-191.N.H.H and class C is 192.N.N.H where N is a network address octet and H is host. Essentially class A is a /8, class b is /16 and class c is /24 network. For the reserved IP range we have 192.168.0-255.0-255 reserved. Why reserve so many class C networks? If someone needed more than 254 hosts, couldn't they just use a reserved class B or class A IP space and subnet as needed? I am sure there is a good reason, I just don't see it...