[GPP-IPv4-2011] Global Policy for Post Exhaustion IPv4 Allocation Mechanisms by the IANA

   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
   contain:

     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
   follows:

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

     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
	 it.

	 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.