[arin-ppml] Recommended Draft Policy ARIN-2020-3: IPv6 Nano-allocations

ARIN info at arin.net
Tue Jul 21 11:06:26 EDT 2020

On 16 July 2020, the ARIN Advisory Council (AC) advanced the following 
Draft Policy to Recommended Draft Policy status:

ARIN-2020-3: IPv6 Nano-allocations

The text of the Recommended Draft Policy is below, and may also be found at:


You are encouraged to discuss all Recommended Draft Policies on PPML 
prior to their presentation at the next ARIN Public Policy Consultation 
(PPC). PPML and PPC discussions are invaluable to the AC when 
determining community consensus.

The PDP can be found at:

Draft Policies and Proposals under discussion can be found at:


Sean Hopkins
Policy Analyst
American Registry for Internet Numbers

Recommended Draft Policy ARIN-2020-3: IPv6 Nano-allocations

AC Assessment of Conformance with the Principles of Internet Number 
Resource Policy:

Recommended Draft Policy ARIN-2020-3 provides for small IPv6 allocations 
to ISPs. This policy would allow the smallest ISP organizations to 
obtain a /40 of IPv6 addresses. This recommended draft is technically 
sound, supported by the community and enables fair and impartial 
administration of number resources by providing the smallest 
organizations the opportunity to obtain an IPv6 allocation without a fee 
increase under the current fee schedule.

Problem Statement:

ARIN’s ISP registration services fee structure has graduated fee 
categories based upon the total amount of number resources held within 
the ARIN registry.

In the case of the very smallest ISPs, if a 3X-Small ISP (with a /24 or 
smaller of IPv4) gets the present minimal-sized IPv6 allocation (a /36), 
its annual fees will double from $250 to $500/year.

According to a Policy Experience Report presented by Registration 
Services to the AC at its annual workshop in January 2020, this 
represents a disincentive to IPv6 adoption with a substantial fraction 
of so-situated ISPs saying “no thanks” and abandoning their request for 
IPv6 number resources when informed of the impact on their annual fees.

This can be addressed by rewriting subsection Initial 
Allocation Size to allow allocation of a /40 to only the smallest ISPs 
upon request, and adding a new clause to cause an automatic 
upgrade to at least a /36 in the case where the ISP is no longer 3X-Small.

Reserving /40s only for organizations initially expanding into IPv6 from 
an initial sliver of IPv4 space will help to narrowly address the 
problem observed by Registration Services while avoiding unintended 
consequences by accidentally giving a discount for undersized allocations.

Policy Statement:

Replace the current with the following:

b. In no case shall an LIR receive smaller than a /32 unless they 
specifically request a /36 or /40.

In order to be eligible for a /40, an ISP must meet the following 

Hold IPv4 direct allocations totaling a /24 or less (to include zero)
Hold IPv4 reassignments/reallocations totaling a /22 or less (to include 
In no case shall an ISP receive more than a /16 initial allocation.

Add as follows:

g. An LIR that requests a smaller /36 or /40 allocation is entitled to 
expand the allocation to any nibble aligned size up to /32 at any time 
without renumbering or additional justification. /40 allocations shall 
be automatically upgraded to /36 if at any time said LIR’s IPv4 direct 
allocations exceed a /24. Expansions up to and including a /32 are not 
considered subsequent allocations, however any expansions beyond /32 are 
considered subsequent allocations and must conform to section 6.5.3. 
Downgrades of any IPv6 allocation to less than a /36 are not permitted 
regardless of the ISP’s current or former IPv4 number resource holdings.

Timetable for Implementation: Immediate


The intent of this policy proposal is to make IPv6 adoption at the very 
bottom end expense-neutral for the ISP and revenue-neutral for ARIN. The 
author looks forward to a future era wherein IPv6 is the dominant 
technology and IPv4 is well in decline and considered optional leading 
the Community to conclude that sunsetting this policy is prudent in the 
interests of avoiding an incentive to request undersized IPv6 allocations.

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