FW: [arin-announce] Change to Whois Query Behavior

Mark Kosters markk at arin.net
Tue Sep 20 18:20:12 UTC 2011

Apologies for the cross post from ARIN-Announce. Thought that many of you
would be interested in hearing about the upcoming ARIN Whois change given
the recent discussion on NANOG.


On 9/19/11 2:00 PM, "ARIN" <info at arin.net> wrote:

>ARIN announces a pending change to Whois query behavior on port 43.
>Prior to 25 June 2011, a query for an IP address in the ARIN region
>would return with that assignment/allocation within the ARIN region, and
>a query in the ARIN region for an IP address with no
>assignment/allocation would result in a ³no match² response. On 25 June,
>a change was misapplied. The intent of this change was to return ARIN¹s
>/8 for IP queries within ARIN¹s region for which there is no
>assignment/allocation, a behavior meant to align ARIN¹s Whois output
>with that of the other RIRs. However, this change introduced an
>unintended behavior of returning ARIN¹s /8, in addition to the desired
>results, in responses where IP addresses had been assigned or allocated.
>This change in behavior has created some confusion. On 2 October, ARIN
>will reinstate the previous behavior for Whois IP queries so that
>results are returned the way they were before 25 June.
>ARIN has provided two examples of a Whois query for reference:
>* Query with ARIN's /8 returned in the result set hierarchy:
>* Query without ARIN's /8 returned in the result set:
>Whois-RWS behavior will not change as it was not affected by the
>configuration change made on 25 June.
>We apologize for any confusion this has caused.
>Mark Kosters
>Chief Technical Officer
>American Registry for Internet Numbers (ARIN)
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