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. Regards, Mark ARIN CTO On 9/19/11 2:00 PM, "ARIN" <info@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: https://www.arin.net/announcements/2011/20110919.html#example1

* Query without ARIN's /8 returned in the result set: https://www.arin.net/announcements/2011/20110919.html#example2

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.

Regards, Mark Kosters Chief Technical Officer American Registry for Internet Numbers (ARIN) _______________________________________________ ARIN-Announce You are receiving this message because you are subscribed to the ARIN Announce Mailing List (ARIN-announce@arin.net). Unsubscribe or manage your mailing list subscription at: http://lists.arin.net/mailman/listinfo/arin-announce Please contact info@arin.net if you experience any issues.