smurf's attack...

I'm sorry, but that's naive. Unless you've taken steps to prevent
it, or you're just lucky, it's trivial to find out a lot of
things. Your mail server, for example, has a mask of 0xFFFFFF00.

Another network at apparently has a mask of 0xFFFFFC00,
and another is 0xFFFFF800.

:: Mike ::

Welcome to the NANOG mailing list, where North American Network OPerators
hold deep weekly debates about the meaning of netmasks, prefixes, CIDR, and
the format of IPv4 addresses.

If the content of this list is even 20% indicative of the state of operation
of the US/CA/MX/GT networks, it is an amazing testimony to the resilience of
the internet.