[Asrg] ipv6 macro expansion example in SPF specification, DNS ranges...

   IPv6:
   %{ir}.%{v}._spf.%{d2}
   
1.0.B.C.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.B.D.0.1.0.0.2.ip6._spf.example.com


cached NXDOMAIN suppressing subdomain lookup attempts seems like the
way to go, if one refers to a DNSWL in a SPF record.
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