Re: Correct CIDR for two networks.

[John Yeung <gallium.arsenide@xxxxxxxxx>]

On Fri, Apr 19, 2024 at 11:59 AM Patrik Schindler <poc@xxxxxxxxxx> wrote:
> Just to make you aware: Tying the size of networks to a "class" for knowing its size has been abandoned for decades. Forget the term "class x network". :-)

Ah, thank you. So the information at the bottom of the page I was
looking at is somewhere between obsolete and misleading, and I did not
know enough to pick out the "good" parts.

Calculators, such as the one Jack linked to, are much easier and more useful.

Interestingly, I have not found a calculator that accepts two IP
addresses (or ranges, as Jim started with) and returns the tightest
CIDR or subnet mask that covers both of them. Would be a fun little
programming exercise.

John Y.