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Now we test nameserver IPv6 addresses as well. When fpdns is given
a hostname to probe, it will test both its IPv4 and IPv6 addresses if the name has both A and AAAA records. Also true for the -D option. For most dual-stack name servers, this probably means we test it twice. However, sometimes the two addresses will be on different servers or at least different processes, so the fingerprint might be different.
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