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See http://7bits.nl/blog/2012/03/26/finding-v6-hosts-by-efficiently-mapping-ip6-arpa for some explanation. This tool is quite rudimentary. It takes 2 or 3 arguments. Example usage: # find all hosts (/128) in this prefix by asking 192.0.2.1 $ ./ip6-arpa-scan.py 0.8.0.0.8.b.d.0.1.0.0.2.ip6.arpa 192.0.2.1 # find all existing /64 networks in this prefix $ ./ip6-arpa-scan.py 0.8.0.0.8.b.d.0.1.0.0.2.ip6.arpa 192.0.2.1 64 It does not look at results at all, beyond checking for NOERROR. If you point it at an auth, and there are delegations, it might drill down into those while asking the auth (because referrals have rcode NOERROR too), wasting a lot of bandwidth and time. This can be mitigated by expanding the tool (perhaps requiring a SOA with every NOERROR), or by pointing the tool at a recursor you have access to. I have not tested this scenario. The progress indicator is very rough; many networks have concentrated their hosts in the lower regions of their ranges, so it's not unlikely to see a very slow climb from 0 to 1 to 2% and then a sudden sprint towards 100%