[arin-ppml] Are we an ISP or an End-User? Can our designation change at a later time?

David Farmer farmer at umn.edu
Wed Jan 4 22:12:29 EST 2023

On Wed, Jan 4, 2023 at 4:32 PM William Herrin <bill at herrin.us> wrote:

> On Wed, Jan 4, 2023 at 11:52 AM Fernando Frediani <fhfrediani at gmail.com>
> wrote:
> > Another thing that I wanted to understand better is the reasoning to
> allocate a significant smaller IPv6 block to a said end-user organization
> given it is not so scarce resource.
> The standard size assignment to an end user is /48 per IETF
> recommendation. That's 65,000 LANs, 2^80 IP addresses. Vanishingly few
> end-user organizations actually have a need for more LANs than that.
> However, since /48 is also the minimum Internet routable size,
> end-user organizations with multiple independently-connected sites may
> need several /48s. That's a minority of end-users but still a
> significant number.

This is all true; However, justifying a larger end-user allocation
(formerly known as an assignment) isn’t that hard either; you justify a /48
per site in a larger multi-site organization; they don’t have to be
independently connected. That is, more than 1 site but less than or equal
to 12 sites receive a /44 allocation; more than 12 but less than or equal
to 192 sites receive a /40 allocation; see the policy for even larger
allocations and a discussion for campus environments. Also, most larger
organizations likely could qualify as an ISP/LIR if they wish.

So, many end-user organizations are receiving /44s, /40s, and even larger
allocations without much trouble. Could the ARIN staff provide an
updated histogram of IPv6 allocation sizes; I haven't seen one in several

I hope that helps.

> ISPs get a /32 so that, by default, they can assign 65,000 /48s to
> their customers and still keep a few for themselves. That's the reason
> they receive significantly more.
> Regards,
> Bill Herrin
> --
> For hire. https://bill.herrin.us/resume/
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David Farmer               Email:farmer at umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
2218 University Ave SE        Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952
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