Re: question about net address

[David Christensen <dpchrist@holgerdanske.com>]

On 3/18/23 16:31, coreyh@free.fr wrote:
> On 19/03/2023 06:17, Kushal Kumaran wrote:
> > On Sat, Mar 18 2023 at 07:28:23 PM, coreyh@free.fr wrote:
> > > Hello
> > >
> > > I know 192.168.1.0/24 is a valid C range for network address.
> > >
> > > but what does 192.168.1.1/24 mean?
> > >
> > > I ask this just for a setting in the SPF:
> > >
> > > spf.pinoad.se.        300    IN    TXT    "v=spf1 ip4:188.66.63.1/24 
> > > -all"
> >
> > It means the same thing.  192.168.1.1/24 is the same range as
> > 192.168.1.0/24, but written by someone not paying too much attention.
>
>
> That's correct. Thanks.


AIUI:

* 192.168.1.0/24 identifies an IPv4 network with an address of 
192.168.1.0 and a network prefix of 24 bits.  The address is within the 
reserved private block 192.168.0.0/16.  The prefix corresponds to a 
class C network.

* 192.168.1.1/24 identifies an IPv4 network interface with an address of 
192.168.1.1 and a network prefix of 24.  The interface is configured to 
communicate over the 192.168.1.0/24 network.


See:

https://en.wikipedia.org/wiki/IPv4_address

https://en.wikipedia.org/wiki/CIDR_notation


David