What determines DNS will query IPV6 address?

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# 1  
Old 01-24-2020
What determines DNS will query IPV6 address?

When I do simple nslookup it does not generate any query for IPV6 (AAAA). But sometimes I see DNS query for both A and AAAA are generated. What decides this? The reason I do not want AAAA query is in most of the cases AAAA records are absent. Hence, if one DNS server fails, the clients keeps attempting to send AAAA query.
# 2  
Old 01-24-2020
The second query is from clients where both IPv4 and IPv6 are enabled. If you do not want the second query on a client and you are only using IPv4, try disabling IPv6 on that particular client.
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