IP "Supernetting": Classless Inter-Domain Routing (CIDR) Hierarchical Addressing and Notation
(Page 4 of 4)
Common Features of "Classful" and Classless Addressing
Note that there are a few aspects of addressing that were defined under the classful scheme that don't change under CIDR:
Finally, note that use of classless addressing requires hardware and software designed to handle it. If the hardware and software are still assuming that they are operating in a classful environment, they will not properly interpret addresses. Since CIDR has now been around for over a decade, this is usually not a problem with modern systems.
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