Lightly used IP addresses

John Curran jcurran at
Fri Aug 13 21:19:20 UTC 2010

On Aug 13, 2010, at 4:06 PM, <bmanning at> wrote:
> 	my assertion to Owen was that his views would apply directly
> 	to the folks under a standard RSA.  My reading of the
> 	LRSA suggests that ARIN has a much narrower remit on recovery
> 	of resources covered by that document. the third camp was/is
> 	a much thornier patch of ground, fraught w/ peril if ARIN
> 	takes action on recovery, at least imho.  #4, well that sounds
> 	like fruitful ground for inter-RIR coordination.
> 	for example, if 75% of the total resource under ARIN administration
> 	is legacy, then 25% is covered by the standard RSA.  Within the 75%,
> 	6% of it is under LRSA and 15% of it is under the standard RSA.
> 	if this characterization is in ballpark, then Owens view on
> 	reclaimation only holds for ~30% of the resource under ARIN administration.

The LRSA provides specific rights which could very likely preclude
reclamation in some circumstances and result in the resources then
remaining as-is with address holder, i.e., this would still prevent 
transfer contrary to the community policy but also prevent reissue.
(this occurs in the LRSA under some circumstances recognizing the 
history of the legacy address space with the community).

Okay, to try and get some numbers back into the thread:  From 
Leslie's Registration Services report in Toronto, pages 6 and 9:
First, I note that the 700 number I used from memory for number of 
organizations was not correct; I gave the total signed, approved, 
and pending. The number 444 signed is what corresponds to the 6% 
under LRSA. Nicely, the actual numbers are in the report, so we see 
6.49 /8 equivalents space under LRSA, out of the total legacy space 
of 73 /8 equivalents (page 9). The RSA space is 33 /8 equivalents,
and total inventory is 106 /8 equivalents. (Randy, does this level
of reporting suffice for your purposes?)

So, recasting final numbers back to the original context:

63% (66.5/106) of the address space managed by ARIN is 
Legacy-not-under-agreement, and ARIN's action with this space 
is governed by the policies adopted by the community.  ARIN 
clearly could be in a difficult situation if policies adopted
needlessly result in impact to these legacy address holders.

6% (6.5/106) of the address space managed by ARIN is 
Legacy-under-LRSA, and has specific contractual language which
may take precedence over community adopted policy (and could 
both prevent transfers from completing and reclamation from 

31% (33/106) of the address space managed by ARIN is per-RSA, 
and ARIN's action with this space is clearly governed by the 
policies adopted by the community.


John Curran
President and CEO

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