William Leibzon wrote: Not an ARIN example but when KPNQwest went out of business, the situation was as you desribe and it would have been difficult to everybody to quickly renumber so their PA assigned customer ip blocks with assistance of RIPE became PI blocks (at least this is how I understood it, people in europe can correct me if this is not right). So the precidents do exist, but they involve having RIR take over the block.

You forget to mention something here: people knew. Even if you were stupid there's no way (if you were a KPNQwest customer) that you could have missed there were in trouble. But that's only for starters: when they did fold, a very large part of the staff continued to operate the network with no pay for days to keep customers up. Kudos to ex-KPNQwest network dudes. So, your ISP has been in financial trouble for a while. For the last two weeks the only reason you were up is because some dedicated people kept the network running on life support on their own time and money. If you begin your renumbering effort by the time you lose connectivity, you deserve to go out of business. Same applies to AS25653: if they're stupid enough to sign a contract that basically say they can be kicked out within 45 days _and_ not prepared to move out within 45 days or so, they're too stupid to be in the ISP business. Period. I have plenty of customers that are "locked-in" with IP addresses. Their upstream does not leverage the fact that they do indeed hold the customer by the balls, because said customer a) pay their bills and b) do not spam. Michel.