If an organization registered an address they are responsible for keeping the contact name up to date. If they don't announce the route, they have not provided a valid contact, and there is no way to contact them, including publishing a list on major mailing lists, then it should be safe to recover the address since every reasonable effort was made to contact them. If a route is not announced, this is a NOOP anyway.
Curtis, You idiot - how could you say such a thing. What about the poor guy who is using the net behind a firewall. ;-) -- Curtis
Curtis You ignorant bozo - I meant it has no effect on routing table size. Any attempt to recover it is a NOOP until we actually need the 192/8 space which won't be for a very long time (after A space is exhausted). ;-) -- Curtis ps - I trust its perfectly acceptable to email flaming insults when replying to yourself.