[arin-ppml] ARIN-prop-137 Global Policy for post exhaustion IPv4 allocation mechanisms by the IANA

ARIN info at arin.net
Tue Mar 8 14:46:37 EST 2011

ARIN-prop-137 Global Policy for post exhaustion IPv4 allocation
mechanisms by the IANA

ARIN received the following policy proposal and is posting it to the
Public Policy Mailing List (PPML) in accordance with the Policy
Development Process.

The ARIN Advisory Council (AC) will review the proposal at their next
regularly scheduled meeting (if the period before the next regularly
scheduled meeting is less than 10 days, then the period may be extended
to the subsequent regularly scheduled meeting). The AC will decide how
to utilize the proposal and announce the decision to the PPML.

The AC invites everyone to comment on the proposal on the PPML,
particularly their support or non-support and the reasoning
behind their opinion. Such participation contributes to a thorough
vetting and provides important guidance to the AC in their deliberations.

Draft Policies and Proposals under discussion can be found at:

The ARIN Policy Development Process can be found at:

Mailing list subscription information can be found
at: https://www.arin.net/mailing_lists/


Communications and Member Services
American Registry for Internet Numbers (ARIN)

## * ##

ARIN-prop-137 Global Policy for post exhaustion IPv4 allocation
mechanisms by the IANA

Proposal Originator: Philip Smith
    co-authors: Alejandro Acosta, Nicolas Antoniello, S. Moonesamy,
    	Douglas Onyango, Medel Ramirez, Masato Yamanishi

Proposal Version: 1

Date: 8 March 2011

Proposal type: new

Policy term: permanent

Policy statement:

   The IANA shall establish a Recovered IPv4 Pool to be utilized post
   RIR IPv4 exhaustion.  The Recovered IPv4 Pool will initially contain
   any fragments that may be left over in the IANA.  It will also hold
   any space returned to the IANA by any other means.

   The Recovered IPv4 Pool will be administered by the IANA.  It will

     a.  Any fragments left over in the IANA inventory after the last
         /8s of IPv4 space are delegated to the RIRs

        - The IANA inventory excludes "Special use IPv4 addresses" as
	 defined in BCP 153 and any addresses allocated by the IANA
	 for experimental use.

     b.  Any IPv4 space returned to the IANA by any means.

   The Recovered IPv4 Pool will stay inactive until the first RIR has
   less than a total of a /9 in its inventory of IPv4 address space.

   When one of the RIRs declares it has less than a total of a /9 in
   its inventory, the Recovered IPv4 pool will be declared active, and
   IP addresses from the Recovered IPv4 Pool will be allocated as

     a.  Allocations from the IANA may begin once the pool is declared

     b.  In each "IPv4 allocation period", each RIR will receive a
         single "IPv4 allocation unit" from the IANA.

     c.  An "IPv4 allocation period" is defined as a 6-month period
         following 1 March or 1 September in each year.

     d.  The IANA will calculate the size of the "IPv4 allocation unit"
         at the following times:

         - When the Recovered IPv4 Pool is first activated
         - At the beginning of each IPv4 allocation period

         To calculate the "IPv4 allocation unit" at these times, the
         IANA will use the following formula:

             IPv4 allocation unit = 1/5 of Recovered IPv4 pool,
                                    rounded down to the next CIDR
                                    (power-of-2) boundary.

	No RIR may get more than this calculation used to determine
	the IPv4 allocation unit even when they can justify a need for

	The minimum "IPv4 allocation unit" size will be a /24.  If the
	calculation used to determine the IPv4 allocation unit results
	in a block smaller than a /24, the IANA will not distribute
	any addresses in that IPv4 allocation period.

     The IANA may make public announcements of IPv4 address
     transactions that occur under this policy.  The IANA will make
     appropriate modifications to the "Internet Protocol V4 Address
     Space" page of the IANA website and may make announcements to its
     own appropriate announcement lists.  The IANA announcements will
     be limited to which address ranges, the time of allocation, and to
     which Registry they have been allocated.


    The policy provides a mechanism for the ongoing distribution of
    IPv4 address space, while removing the areas that have been
    problematic in previous attemts at this proposal. The proposal:

     - Permits regional variation in runout policy amongst RIRs to
       be accounted for in the distribution of the Recovered IPv4 Pool

     - Prevents the possibility of a single RIR being eligible to
       be allocated the entire Recovered IPv4 Pool in the first
       (and perhaps only) allocation period

     - Removes two areas of policy that have failed to reach
       agreement in previous attempts at this proposal:

        - How addresses should be placed in the Recovered IPv4 Pool
        - References to how transfers should or should not take

Timetable for implementation:

    Once consensus has been reached in each of the 5 RIR regions, the
    policy will be forwarded to ICANN for approval and then implemented
    by the IANA.

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