Hi there,

I want to divide a private network in to subnets (common enough). We
are currently using 192.168.1.* for the whole network, no subnets.

I want to expand the space and have three subnets with up to 2000 hosts
on each.

Can I use 192.168.[1-8].* for the first, 192.168.[9-16].* for the
second etc, with a 255.255.248.0 netmask?

I know that 192.168.*.* is a Class C which is traditionally /24 but I
also know that classful subnets are deprecated. So is /21 okay for
192.168.*.* ?

Also, on principles: each subnet should be the same size (netmask),
correct?

Thanks for all advice.

David.