Understanding IP class range.

[Ed]

for IPv4, the size of the local net is 2 to the power of 32 net the
CIDR (network portion) or for 192.168.0.0/24 the local net is 2 to the
power of (32-24) or 2^8 or 256 - starting at 192.168.0.0 and ending
with 192.168.0.255
for IPv6 the network and local sizes are set at 32 each so in the
distant future you won't have to worry about this..

nice class breakout - Kevin & Kenn - thx

On Mon, Aug 31, 2015 at 2:55 AM,  <parabellum7 at yahoo.com> wrote:
> Hi Keith,
>
> If I recall correctly, the /24 part of 192.168.0.0/24 is the subnet specified in CIDR notation (Classless Inter Domain Routing).
>
> Think in binary terms, that /24 equals 11111111.11111111.11111111.00000000  (note there's 24 1's) equals 255.255.255.0 so is a class C subnet with the first three octets being the network mask.
>
> Likewise if you had an IP addy followed by a /8 that equals 11111111.00000000.00000000.00000000 equals 255.0.0.0 so is a class A subnet.
>
> Called octets cuz there's 8 bits hence a decimal max of 255.
>
> CIDR is usually seen at ISP's or in enterprise networks that need to subnet further as the network mask does not have to align with the octet boundary as it does in the classfull network addressing we're used to. That's where things get weird and all this because those silly routers only speak binary. :]
>
> If you're seeing 192.168.0.0/24 in a zenmap target field it means scan everything from and including 192.168.0.0 to 192.168.0.255.
>
>
> IP network classes or Classfull Network Addressing
>
>         - Range -                                               - mask -                # of networks   # of nodes      CIDR mask
> A       1.1.1.1 -       126.255.255.255         255.0.0.0               126                             16,777,214      /8
> B       128.0.0.1 - 191.255.255.255             255.255.0.0             16,384                  65,534          /16
> C       192.0.0.1 - 223.255.255.255             255.255.255.0   2,097,151               254                     /24
> D       224.0.0.1 - 239.255.255.255
> E       240.0.0.1 - 255.255.255.255
>
>
>
> --Kenn
>
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