Re: [Exim] question about ACL

Sean Witham wrote:

> Adam D. Barratt wrote:
>
>> Matthias Lewandowski wrote, Friday, December 12, 2003 10:32 AM
>> [...]
>>
>>> /24 is marking the number of adresses matching.
>>> It's the same as the netmask 255.255.255.0 (class-c)
>>
>>
>>
>> Well, aside from the fact that only a limited subset of /24s are Class
>> Cs...
>> (given that there are 256 /24s and only 32 Class Cs). :-)
>>
>
>
> err, no, there potentially 2^21 class C addresses, i.e. 192.0.0.0 -
> 223.255.255.255.
>
> Obviously not all the potential address are available for allocation but
> there are a lot more than 256 !!
>


In fact to be a little more accurate there are 2^21 potential Class C
subnets. The addresses would add up closer to 2^29 actual addresses.

--Sean