afaik, /24 is the cidr (classless inter-domain routing) notation for
netmasks.  under cidr, there aren't the standard class a, b, and c
networks -- there's also supersetted class a and b groups, made up of
class c addresses that have the same high 8 or 16 bits, respectively.
there's also every range in between, removing the restrictions of having
256/65536/etc addresses allocated to a single group.  /24 means a netmask
of 24 bits, aka a class c type address, /16 would be an effective class b,
and so forth.

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On Sun, 31 Jan 1999, Bruno Randolf wrote:

> could anyone explain to me what the /x notation (for example /24) means
> when used with ip address spaces?
> or point me to some good ressources, please.
> 
> thanks,
> Br1
> 
> 
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