Incrementing INET fields

Hi Guys

Is there any particular reason why you can't do something like:select '10.1.1.1'::inet + 1;

I would dearly like to be able to autoincrement an INET field. Even better I
would like to be able to specify subnet or range limits on the
autoincrement, but that would be just icing on the cake..

Is there some technical reason (other than finite developer time) that this
isn't possible at present?

Regards
-- 

Peter Nixon
http://www.peternixon.net/
PGP Key: http://www.peternixon.net/public.asc