allowing queries from all IPv4 addresses but only a range of IPv6 addresses

[Dennis Perisa]

Hello community,

I have a requirement to configure BIND 9.7.3 to allow queries from any
IPv4 address and only a specific IPv6 prefix.

The allow-query statement takes an address match list as argument, but
I'm not sure how I can specify 'any IPv4 host' without having to use
the 'any' keyword (which matches on ALL IPv4 and IPv6 addresses).

Hoping you can help,
Dennis