watchNS/a.ns.nsatc.netについて、ここに記述してください。
level3の登録しているドメイン名： https://en.wikipedia.org/wiki/Level_3_Communications
NXDOMAIN response for ns.nsatc.net
$ dnsq a a.ns.nsatc.net a.ns.nsatc.net 1 a.ns.nsatc.net: 188 bytes, 1+1+4+4 records, response, authoritative, noerror query: 1 a.ns.nsatc.net answer: a.ns.nsatc.net 172800 A 8.26.215.27 authority: nsatc.net 86400 NS au-1.ns.nsatc.net authority: nsatc.net 86400 NS uk-1.ns.nsatc.net authority: nsatc.net 86400 NS l.ns.nsatc.net authority: nsatc.net 86400 NS us-ca-5.ns.nsatc.net additional: au-1.ns.nsatc.net 172800 A 113.29.17.20 additional: uk-1.ns.nsatc.net 172800 A 8.254.119.155 additional: l.ns.nsatc.net 172800 A 8.26.197.27 additional: us-ca-5.ns.nsatc.net 172800 A 8.26.193.153
$ dnsq ns ns.nsatc.net a.ns.nsatc.net 2 ns.nsatc.net: 83 bytes, 1+0+1+0 records, response, authoritative, nxdomain query: 2 ns.nsatc.net authority: nsatc.net 900 SOA admin.nsatc.net dns.level3.net 1511809432 10800 2700 3600000 900
$ dnsq any ns.nsatc.net a.ns.nsatc.net 255 ns.nsatc.net: 83 bytes, 1+0+1+0 records, response, authoritative, nxdomain query: 255 ns.nsatc.net authority: nsatc.net 900 SOA admin.nsatc.net dns.level3.net 1511809432 10800 2700 3600000 900