Non-byte Aligned Delegation
AS 2 may aggregate 10.1/16 and it allocates
10.1.128/19 to AS 3
$ORIGIN 1.10.bgp.in-addr.arpa. @ AS 2 16 128/19 NS ns1.as3.net.
128 CNAME 128.128/19 129 CNAME 129.128/19 … 159 CNAME 159.128/19
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