Internet Assigned Numbers Authority (IANA) Policies for Allocation of
IPv4 Blocks to Regional Internet Registries

APNIC
ARIN
LACNIC
RIPE NCC

Document ID: ripe-344
Date: 19 April 2005

Abstract

This document describes the policy governing the allocation of IPv4
address space from the IANA to the Regional Internet Registries
(RIRs). This document does not stipulate performance requirements in
the provision of services by IANA to an RIR in accordance with this
policy. Such requirements should be specified by appropriate
agreements among the RIRs and ICANN.

1. Allocation Principles

    * The IANA will allocate IPv4 address space to the RIRs in /8
      units.

    * The IANA will allocate sufficient IPv4 address space to the RIRs
      to support their registration needs for at least an 18 month
      period.

    * The IANA will allow for the RIRs to apply their own respective
      chosen allocation and reservation strategies in order to ensure
      the efficiency and efficacy of their work.

2. Initial Allocations

Each new RIR shall, at the moment of recognition, be allocated a new
/8 block by the IANA. This allocation will be made regardless of the
newly formed RIR's projected utilization figures and shall be
independent of the IPv4 address space that may have been transferred
to the new RIR by the already existing RIRs as part of the formal
transition process.

3. Additional Allocations

A RIR is eligible to receive additional IPv4 address space from the
IANA when either of the following conditions are met.

    * The RIR's AVAILABLE SPACE of IPv4 addresses is less than 50%
      of a /8 block.

    * The RIR's AVAILABLE SPACE of IPv4 addresses is less than its
      established NECESSARY SPACE for the following 9 months.

In either case, the IANA shall make a single allocation of a whole
number of /8 blocks, sufficient to satisfy the established NECESSARY
SPACE of the RIR for an 18 month period.

3.1 Calculation of AVAILABLE SPACE

The AVAILABLE SPACE of IPv4 addresses of a RIR shall be determined as
follows:

    AVAILABLE SPACE = CURRENTLY FREE ADDRESSES + RESERVATIONS
    EXPIRING DURING THE FOLLOWING 3 MONTHS - FRAGMENTED SPACE

FRAGMENTED SPACE is determined as the total amount of available blocks
smaller than the RIR's minimum allocation size within the RIR's
currently available stock.

3.2 Calculation of NECESSARY SPACE

If the applying Regional Internet Registry does not establish any
special needs for the period concerned, NECESSARY SPACE shall be
determined as follows:

    NECESSARY SPACE = AVERAGE NUMBER OF ADDRESSES ALLOCATED
    MONTHLY DURING THE PAST 6 MONTHS * LENGTH OF PERIOD IN MONTHS

If the applying RIR anticipates that due to certain special needs the
rate of allocation for the period concerned will be different from the
previous 6 months, it may determine its NECESSARY SPACE as follows:

       1. Calculate NECESSARY SPACE as its total needs for that period
          according to its projection and based on the special facts
          that justify these needs.
       
       2. Submit a clear and detailed justification of the above
          mentioned projection (Item A).

    If the justification is based on the allocation tendency prepared
    by the Regional Internet Registry, data explaining said tendency
    must be enclosed.

    If the justification is based on the application of one or more of
    the Regional Internet Registry's new allocation policies, an
    impact analysis of the new policy/policies must be enclosed.

    If the justification is based on external factors such as new
    infrastructure, new services within the region, technological
    advances or legal issues, the corresponding analysis must be
    enclosed together with references to information sources that will
    allow verification of the data.

If IANA does not have elements that clearly question the Regional
Internet Registry's projection, the special needs projected for the
following 18 months, indicated in Item A above, shall be considered
valid.  4. Announcement of IANA Allocations

When address space is allocated to a RIR, the IANA will send a
detailed announcement to the receiving RIR. The IANA will also make
announcements to all other RIRs, informing them of the recent
allocation. The RIRs will coordinate announcements to their respective
membership lists and any other lists they deem necessary.

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
