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