Re: netmask question

[Timothy M Butterworth <timothy.m.butterworth@gmail.com>]

On Mon, May 22, 2023 at 6:12 AM <coreyh@free.fr> wrote:

On 22/05/2023 11:08, Tim Woodall wrote:
> On Mon, 22 May 2023, coreyh@free.fr wrote:
>

>>
>> Hello,
>>
>> In CIDR a host address is xx.xx.xx.xx/32 which means 255.255.255.255.
>> isn't it?
>>
>
> It depends on what question you're asking.
>
> An individual address is a /32, but a host address might be listed as a
> /24 for example. This means there are 256 addresses that can be reached
> without routing.

I see. thanks.
In some use cases my configuration requires a host address with /32 for
CIDR. such as postscreen whitelist stuff.

I know 192.168.1.0/24 means a C class.
But 192.168.1.100/24 means what? C class or that separated address
192.168.1.100?

192.168.1.0/24 is the class C network address and 192.168.1.100/24 is the class C host address. /24 is class C, /8 is Class A, /16 is Class B.

 

kind regards
Corey

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