No, we have registries to act as registries, the ISPs should be
checking them, and double checking. It isn't something that is going
to change every day or every week. Once you get it set up, it is going
to be stable for a while. Sure, it means a little more work in setting
up a customer, but it also means that if all your neighbors do the same
thing, you field many fewer calls dealing with stupid DoS crap.