On Tue, 18 Oct 94 13:30:08 EDT Greg Sylvain said:
> Hello hello,
> I have a pretty basic question here, is the class C net address
>193.0.0 valid ?
Indeed it is. It is owned and used by the RIPE NCC (Reseaux IP
Europeens Network Coordination Centre); try
whois -h whois.ripe.net 18.104.22.168
for the full scoop. So **please** don't use this address, even
in an internal network - there are addresses for that purpose
which you'll find in RFC1597.
> Currently this is the address of our (internal) net. We are
>going to be hooking this net to a firewall which will then be
>connected to the Internet. Basically, I don't want to have to renumber
>all of these address if I don't have to. (I know it should of
>been done right the first time and it would be the PC thing to
>do, but everything in time. If we could put it off that would be great.)
> I know how to keep DNS and mail straight so that it can forward all
>information to the appropriate host, but all is lost if the IANA assigns
>193.0.0 to someone else that we may want to (say) send mail to.
>(I know they haven't yet; at least up till recently).
>I can not find anywhere in the RFC's that says that this is a valid
>(invalid) Class C address and therefore will potentially be assigned to
>someone. I'm under the impression that having the 2nd and 3rd quads of a
>class C address being zeroed is invalid. (Since Internet hosts still
>have to be able to handle broadcasts of 0 and -1, with the host number masked
>out by the netmask. This would mean a broadcast to all 193.x.y.z hosts is
> Also, if this *is* valid, why hasn't it already been assigned ??? It
>seems like the IANA has done a pretty good job of *not* assigning it.
> If it *is* valid, could you give me a reference;I'm surely
>missing more detail here. Or if it is *not* valid, would anyone
>have a suggestion of an automated way to change a large amount of hosts
>(PC's and UNIX).
> Thanks in advance,
>Greg Sylvain gms @
> Phone: 301.251.4136
> FAX : 301.738.9284