Looking at rfc2317 I see the example zone file
$ORIGIN 2.0.192.in-addr.arpa. @ IN SOA my-ns.my.domain. hostmaster.my.domain. (...) ;... ; <<0-127>> /25 0/25 NS ns.A.domain. 0/25 NS some.other.name.server. ; 1 CNAME 1.0/25.2.0.192.in-addr.arpa. 2 CNAME 2.0/25.2.0.192.in-addr.arpa. 3 CNAME 3.0/25.2.0.192.in-addr.arpa. ; ; <<128-191>> /26 128/26 NS ns.B.domain. 128/26 NS some.other.name.server.too. ; 129 CNAME 129.128/26.2.0.192.in-addr.arpa. 130 CNAME 130.128/26.2.0.192.in-addr.arpa. 131 CNAME 131.128/26.2.0.192.in-addr.arpa. ; ; <<192-255>> /26 192/26 NS ns.C.domain. 192/26 NS some.other.third.name.server. ; 193 CNAME 193.192/26.2.0.192.in-addr.arpa. 194 CNAME 194.192/26.2.0.192.in-addr.arpa. 195 CNAME 195.192/26.2.0.192.in-addr.arpa. That has no NS server defined for the zone, just the ranges of the zone. Is that valid? o -- Jack Tavares
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