watchNS/graded.brについて、ここに記述してください。

$ dig -t ns graded.br. +dnssec @a.dns.br

; <<>> DiG 9.11.2 <<>> -t ns graded.br. +dnssec @a.dns.br
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25332
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;graded.br.                     IN      NS

;; AUTHORITY SECTION:
graded.br.              86400   IN      NS      ns1170.dns.dyn.com.
graded.br.              86400   IN      NS      ns2196.dns.dyn.com.
graded.br.              86400   IN      NS      ns3180.dns.dyn.com.
graded.br.              86400   IN      NS      ns4172.dns.dyn.com.
graded.br.              900     IN      NSEC    gru.br. NS RRSIG NSEC
graded.br.              900     IN      RRSIG   NSEC 5 2 900 20180119100000 20180112100000 35712 br. Y8qHs3GJzrjqwJNKm5e1qu36/y1mpdgGzdZdaX89h/p6H1np8HesVb2P QSaBojGY9PM9IWv1a1r5Px7WPCMhc/GWF+RVUKhZT1MD4Yv4vHou7r56 byVcdSWAyOz8zIcotFtUB1CgEH6jaxa7vLH7tHmIWHEbWe60SIk7yJWh sifoEKtOwuDMLakFWfb1QRK7VwBSBFcpELiwzNTFzJNmOA==

;; Query time: 303 msec
;; SERVER: 200.160.0.10#53(200.160.0.10)
;; WHEN: Tue Jan 16 13:53:57 JST 2018
;; MSG SIZE  rcvd: 355