>UCSD Caida uses it for their network telescope (pretending to use it for amateur radio) and won't give it back.

Why do we have to convince them to give it back? It's not like IP addresses are tangible and we have to break into their offices to steal them. Major ISPs could stop all routes with them and those addresses could be recovered and reassigned to other AS's

I understand this is quite a big threshold to cross, but it feels necessary.