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Re: Finding v6 hosts by efficiently mapping ip6.arpa
From: Daniel Miller <bonsaiviking () gmail com>
Date: Wed, 4 Apr 2012 21:42:33 -0500

In regards to scanning the 2a01:238:42a8:e700::/48, I just did, got 4 hosts
in less than 2 seconds.

This might have to do with different DNS servers treating incomplete
names differently. That's why I suggested a "check" function to see
how it handles a known-good PTR record being truncated. If it doesn't
treat it differently than a nonexistent record, then there's no point
in completing the search.

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