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Re:We're about to hit phase 3 of ARIN IPV4 rationing by mfincham on Wednesday July 31, 2013 @12:21AM (#6131872)
It depends on the policies of the RIR (Regional Internet Registry) in the region where the IPs are from.

That said, if you're willing to ignore the RIR's policies (which a lot of people do) you can usually "black market" trade IP addresses, so long as you can convince your upstreams to accept them (which they usually will).

Re:We're about to hit phase 3 of ARIN IPV4 rationing by duskwuff on Wednesday July 31, 2013 @01:29AM (#6132079)
Many of the legacy allocations were made before RIRs existed, so no policies really apply.
Re:We're about to hit phase 3 of ARIN IPV4 rationing by mfincham on Monday August 05, 2013 @06:05AM (#6159264)
Sure, but when you want to update the WHOIS / reverse DNS or whatever you have to convince an RIR. If you don't care then I guess that's fine.