[arin-ppml] Policy Proposal (Global): Allocation of IPv4 Blocks to Regional Internet Registries - Revised

Owen DeLong owen at delong.com
Wed Mar 11 02:27:30 EDT 2009

On Mar 10, 2009, at 6:14 PM, John Santos wrote:

> Maybe I just didn't read this closely enough, but I don't see where it
> actually *requires* an RIR to return returned address space to the  
In the description of phase one, it's pretty clear that the intent is  
that RIRs
do not reissue returned blocks and instead shall pass them back to the

> As far as I can tell, every 6 months, an RIR returns *surplus* address
> space (presumably acquired from returned V4 blocks) to IANA which can
> then be delegated to other RIRs.  There didn't seem to be any criteria
> for determining what's "surplus".  Does the RIR just decide it now has
> more than it will need in the forseeable future and elect to return it
> so other RIRs can use it?  Is there no mechanism currently in place to
> do that?  Is the idea here just that after widespread IPv6 adoption,
> lots of v4 space will get returned, mostly to ARIN since ARIN has the
> most space, and there may still be pent up demand for it in other
> regions.  For example, a lot of poorer countries may be adopting
> internets based on old, obsolete tech that they can acquire cheap on
> the used market, but doesn't do IPv6.  This would give them a
> mechanism to acquire abandoned v4 addresses (indirectly) from ARIN.
Nope... Every 6 months, an RIR returns all reclaimed address space
is how I read the policy.

> If this is *all* this policy is intended to accomplish, then fine.
> If an RIR is *required* to return returned addresses to IANA despite
> ongoing need within that RIR, then this is just busy work, since  
> they'll
> immediately have to turn around and get more, probably different
> addresses back from IANA and causing bureaucratic delays and routing
> churn, since the addresses will go right back to the RIRs with the
> most demand.
Except it limits what they can get back from IANA to one allocation unit
per 6 month cycle regardless of how much more they need.


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