> On Tue, May 23, 2023 at 08:24:10AM +0800, Tom Reed wrote:
>> Sorry for my newbie question too.
>>
>> If I know the network addr: 192.168.1.0
>> And know the broadcast addr: 192.168.1.255
>> Then I should have the possibility to cal the netmask addr:
>> 255.255.255.0
>>
>> Isn't it?
>
> Not necessarily. PROBABLY yes, but you can't be certain.
>
> The netmask in this example could be either /23 or /24.
>
> Why are you asking these questions? What's your ACTUAL issue?
>
IIRC, last year my ISP gives me 8 IPv4, they said the first is network
addr, the last is broadcast addr, then I have to calculate the netmask by
myself.
regards.
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