Actually, what is not allowed for hosts is to have the "host" half of the address (based on the netmask) be all 0 bits or all 1 bits. That still allows for the last octet to be 0 (though not for standard Class C IP addresses, which are the most common for most people).

So I still think trying to disallow such is a mistake.

        - tye (but my friends call me "Tye")