The answer to my question was: The Net::DNS::Resolver library will use IPv6 transport if the appropriate libraries (Socket6 and IO::Socket::INET6) are available and the address the server tries to connect to is an IPv6 address. Self-solved.

In reply to Re^2: Net::DNS::Resolver using IPv6 transport in nameservers by elsifsheep
in thread Net::DNS::Resolver using IPv6 transport in nameservers by elsifsheep

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