Repeated Blacklisting / IP reputation

Martin Hannigan martin at
Tue Sep 15 02:21:42 UTC 2009

On Mon, Sep 14, 2009 at 2:58 PM, Justin Shore <justin at>wrote:

> Frank Bulk wrote:
>> With scarcity of IPv4 addresses, organizations are more desperate than
>> ever
>> to receive an allocation.  If anything, there's more of a disincentive
>> than
>> ever before for ARIN to spend time on netblock sanitization.
>> I do think that ARIN should inform the new netblock owner if it was
>> previously owned or not.  But if ARIN tried to start cleaning up a
>> netblock
>> before releasing it, there would be no end to it.  How could they check
>> against the probably hundreds of thousands private blocklist?
> They could implement a process by which they announce to a mailing list of
> DNSBL providers that a given assignment has been returned to the RIR and
> that it should be cleansed from all DNSBLs.

You mean like this?


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