$TTL 3600
$ORIGIN recursor.engine.xa.

@                       SOA  (
                                   ns1
                                   root
                                   2023103100
                                   86400
                                   14400
                                   3600000
                                   3600
                                 )

@                       NS    ns1
ns1                     A     127.30.1.21
ns1                     AAAA  fda1:b2:c3:0:127:30:1:21
ns2                     A     127.30.1.22
ns2                     AAAA  fda1:b2:c3:0:127:30:1:22

$ORIGIN cname.recursor.engine.xa.
@                       NS    ns1
ns1                     A     127.30.1.31
ns1                     AAAA  fda1:b2:c3:0:127:30:1:31