Lightly used IP addresses

John R. Levine johnl at
Fri Aug 13 18:15:51 UTC 2010

>> I don't entirely understand the process.  Here's the flow chart as far
>> as I've figured it out:
>> 1.  A sells a /20 of IPv4 space to B for, say, $5,000
>> 2.  A tells ARIN to transfer the chunk to B
>> 3.  ARIN says no, B hasn't shown that they need it
>> 4.  A and B say screw it, and B announces the space anyway
>> 5.  ???
> 6.	ARIN receives a fraud/abuse complaint that A's space is being used by B.
> 7.	ARIN discovers that A is no longer using the space in accordance with their RSA
> 8.	ARIN reclaims the space and A and B are left to figure out who owes what to whom.

9.  A and B ignore ARIN's email and continue to announce what they've been 

10.  ARIN attempts to allocate the /20 to someone else, who is not amused.

Note that at this point ARIN presumably has no more v4 space left, so a 
threat never to allocate more space to A or B isn't very scary.  Given its 
limited practical leverage, ARIN is only effective insofar as its members 
and customers agree that playing by ARIN's rules is more beneficial than 
ignoring them.


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