[arin-ppml] ARIN-prop-168 Promote 4byte ASN Usage

ARIN info at arin.net
Tue May 1 14:31:44 EDT 2012

ARIN-prop-168 Promote 4byte ASN Usage

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)

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ARIN-prop-168 Promote 4byte ASN Usage

Proposal Originator: Joe Maimon

Proposal Version: 1.0

Date: 1 May 2012

Proposal type: Modify

Policy term: Temporary

Policy statement:

Add section 5.2

5.2 Guidelines

ARIN will issue AS Numbers under the following guidelines.

5.2.1 Unused

ARIN will attempt to assign to the organization an AS Number which has
neither been previously assigned nor used, as available.

5.2.2 Requests

An organization may request from ARIN either a specific AS Number or
type of AS Number, if available to ARIN. The organization must provide
to ARIN's satisfaction technical justification for its request. ARIN may
review the data directly with all involved parties.

5.2.3 Rectification

ARIN, with suitable privacy considerations in place, may reuse the
provided technical documentation in such public forums as it deems
necessary to promote the rectification of the documented causes.

5.2.4 Restrictions

Assignments received via 5.2.2 requests are additionally restricted from
being transferred for a period of 24 months post assignment.

5.2.5 Release

An organization can exchange the 5.2.2 number for a 5.2.1 number, after
which time the restriction on transferring the assignment will be released.

5.2.6 Publication

This section provides neither requirement nor recommendation that ARIN
publicize its available AS Numbers.

5.2.7 Expiration

ARIN may retire section 5.2 anytime after a period of 24 calendar months
without any completed 5.2.2 requests.


Unless otherwise requested, providing an ASN with no baggage or history
should be preferential to both the organization and to ARIN.

The restrictions and clauses regarding technical justification are
designed for the promotion of 4byte ASN uptake and preservation of 2byte
ASN's for those who truly need them. Additionally, this may help to
assist in resolving apparently pervasive obstacles in the ARIN region to
using 4byte ASN's.

Further, if an organization does have a valid technical justification
for a specific AS Number that is available, for example, when a network
was built with an ASN that was subsequently reclaimed due to accidental
negligence or other similar cases, there is little benefit to ARIN
refusing to provide the organization what it can show it needs.

Should this policy become a relic (we hope), ARIN is expressly
authorized to excise it.

Timetable for implementation: Immediate.

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