Deaggregating for emergency purposes

I'll shut up now, lest I "invent" something that smellls too much
like DNS. (Gee, maybe including some sort of "ASN authorized to
advertise this IP space" in an-addr.arpa would be too easy.)

  See http://www.isi.edu/~bmanning/inet98.html
  for ways to do just this...

--bill