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
}}}