On 16 May 2024, the ARIN Advisory Council (AC) accepted “ARIN-prop-333: Rewrite 
of NRPM Section 4.4 Micro-Allocation” as a Draft Policy.

Draft Policy ARIN-2024-5 is below and can be found at:

https://www.arin.net/participate/policy/drafts/2024_5

You are encouraged to discuss all Draft Policies on PPML. The AC will evaluate 
the discussion to assess the conformance of this draft policy with ARIN's 
Principles of Internet number resource policy as stated in the Policy 
Development Process (PDP). Specifically, these principles are:

* Enabling Fair and Impartial Number Resource Administration
* Technically Sound
* Supported by the Community

The PDP can be found at:

https://www.arin.net/participate/policy/pdp/

Draft Policies and Proposals under discussion can be found at: 
https://www.arin.net/participate/policy/drafts/

Regards,

Eddie Diego
Policy Analyst
American Registry for Internet Numbers (ARIN)


Draft Policy ARIN-2024-5: Rewrite of NRPM Section 4.4 Micro-Allocation

Problem Statement:  

The current NRPM Section 4.4 language hasn’t aged well. As the ARIN 53 policy 
experience report demonstrated, 4.4 has also become difficult to implement by 
ARIN staff. Growth and use of Internet Exchanges has also changed. The overhaul 
seeks to improve technical soundness, respect the privilege of a dedicated pool 
and to more closely observe conservation principles using clear, minimum and 
enforceable requirements and underscoring the value of routability of assigned 
prefixes as required.

ARIN 4.4 CI Assignments

The intent of this policy is not to unreasonably preclude the use of an 
allocated or assigned prefix in servicing the needs of critical infrastructure 
of the Internet.

ARIN will reserve a /15 equivalent of IPv4 address space for Critical 
Infrastructure (CI) of the Internet within the ARIN RIR service area. 
Assignments from this pool will be no smaller than a /24. Sparse allocation 
will be used whenever practical. CI includes Internet Exchanges, IANA 
authorized root servers, ccTLD operators, ARIN, and IANA. Addresses assigned 
from this pool may be revoked if no longer in use or not used for approved 
purposes. Only Section 8.2 transfers are allowed. Use of this policy for CI is 
voluntary. ARIN will publish all 4.4 allocated addresses for research purposes.

4.4.1 Internet Exchange Assignments

• Internet Exchange operators must justify their need by providing the 
following:

• A minimum of three initial participants connected to a physically present 
ethernet switch fabric to be used for the purpose of Internet Exchange 
facilitated peering

• Justification must include:
        - Three unique participant names and ASNs not under common control
        - Direct contact information for each participant

• Staff can reasonably validate hardware existence and participants intent

• Applicant Internet Exchange affiliated ASNs are not eligible to be included 
in meeting the participant requirement

• Assigned addresses may be publicly reachable at the operators discretion and 
be used to operate all of the Internet Exchange's infrastructure

4.4.2 Root and ccTLD Assignments

Root and ccTLD operators will provide justification of their need and 
certification of their status as currently active zone operators.



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