Re: Allowing PTR queries only for specific subnets ?

[Daisuke HIGASHI via Unbound-users]

  If you need complicated query handling/manipulation/view-like function
for Unbound, consider to place dnsdist ( dnsdist.org ) in front of your
Unbound instance.

Dnsdist with few lines of Lua script (it also runs LuaJIT) should do what
you want.