Purchased IPv4 Woes

valdis.kletnieks at vt.edu valdis.kletnieks at vt.edu
Sun Mar 12 15:40:28 UTC 2017

On Sun, 12 Mar 2017 11:11:41 -0400, "Chuck Church" said:
> Maybe a silly idea, but shouldn't the sale of a block of addresses (RIR
> ownership change) trigger a removal of that block from all reputation list
> databases?  If I buy a car from a police auction, I'm fairly sure the FBI
> doesn't start tailing me, because the car was once used for less than legal
> purposes.  New owner, clean slate.

How does Spamhaus find out the block has been resold?

How do other DNS-based blacklist operators find out?

How do all the AS's that have their own internal blacklists find out that
they should fix their old listings?  (Note that this is the exact same problem
as "We got blacklisted because of a bad customer, we axed the customer, but
we're still blacklisted", which has been a an unsolved problem for decades now).

And it's awfully easy to game the system by just reselling the block between
a group of shell companies run by bad actors.

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