DNS/watch/cns13.sphere.ad.jpについて、ここに記述してください。

公開キャッシュサーバらしい。DNSSEC対応だとも。

$dnsname 203.138.63.115

cns13.sphere.ad.jp

$ dnsq a qmail.jp 203.138.63.115

1 qmail.jp:
174 bytes, 1+0+7+2 records, response, weird ra, noerror
query: 1 qmail.jp
authority: jp 25607 NS c.dns.jp
authority: jp 25607 NS e.dns.jp
authority: jp 25607 NS f.dns.jp
authority: jp 25607 NS b.dns.jp
authority: jp 25607 NS g.dns.jp
authority: jp 25607 NS d.dns.jp
authority: jp 25607 NS a.dns.jp
additional: f.dns.jp 78097 A 150.100.2.3
additional: g.dns.jp 69165 A 203.119.40.1

[fg].dns.jp のAレコードはなんだ。　jp の参照も余計な気がするが。

%dnsq ns 7netshopping.jp 203.138.63.115

2 7netshopping.jp:
115 bytes, 1+0+4+0 records, response, weird ra, noerror
query: 2 7netshopping.jp
authority: 7netshopping.jp 80416 NS ns.necidc.net
authority: 7netshopping.jp 80416 NS ns2.necidc.net
authority: 7netshopping.jp 80416 NS ns3.necidc.net
authority: 7netshopping.jp 80416 NS ns01.7netshopping.jp

%dnsq a ns.necidc.net 203.138.63.115

1 ns.necidc.net:
149 bytes, 1+0+5+2 records, response, weird ra, noerror
query: 1 ns.necidc.net
authority: necidc.net 86335 NS ns3.necidc.net
authority: necidc.net 86335 NS ns2.necidc.net
authority: necidc.net 86335 NS ns5.necidc.net
authority: necidc.net 86335 NS ns4.necidc.net
authority: necidc.net 86335 NS ns.necidc.net
additional: ns4.necidc.net 52356 A 121.83.216.162
additional: ns5.necidc.net 52356 A 121.83.216.163

%dnsq a ns4.necidc.net 203.138.63.115

1 ns4.necidc.net:
149 bytes, 1+1+5+1 records, response, weird ra, noerror
query: 1 ns4.necidc.net
answer: ns4.necidc.net 52334 A 121.83.216.162
authority: necidc.net 86313 NS ns3.necidc.net
authority: necidc.net 86313 NS ns4.necidc.net
authority: necidc.net 86313 NS ns5.necidc.net
authority: necidc.net 86313 NS ns.necidc.net
authority: necidc.net 86313 NS ns2.necidc.net
additional: ns5.necidc.net 52334 A 121.83.216.163

%dnsq a ns5.necidc.net 203.138.63.115

1 ns5.necidc.net:
149 bytes, 1+1+5+1 records, response, weird ra, noerror
query: 1 ns5.necidc.net
answer: ns5.necidc.net 52318 A 121.83.216.163
authority: necidc.net 86297 NS ns5.necidc.net
authority: necidc.net 86297 NS ns.necidc.net
authority: necidc.net 86297 NS ns3.necidc.net
authority: necidc.net 86297 NS ns4.necidc.net
authority: necidc.net 86297 NS ns2.necidc.net
additional: ns4.necidc.net 52318 A 121.83.216.162