class-C designation

Bryan Irvine sparctacus at
Sat Oct 6 02:28:46 UTC 2007

Related in no way to BIND at all, but I degress.

On 10/5/07, Jim Pazarena <bind at> wrote:
> I have just been assigned a /23 network.
> I am used to /24 and referring to it as a "class-C".
> Is there a name which may refer to a /23 network? Or must I simply
> refer to it a "two back-to-back class-C's" ?

I think most people would just say "i've got a /23" and people who
care already know what you mean.

> Second question. In a /23, is it permissible for me to use the inner .255/.0 numbers?
> The telco told me I could not use them, but it doesn't make sense if indeed they
> have routed me a /23.

You cannot use the 'network id' or the 'broadcast id'.  So yes the
inner .255, and .0 will work just fine.


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