TLD/com/hp.comについて、ここに記述してください。

dec.com からみで、hpl.hp.com も調べてみる。

$ dnsq ns hpl.hp.com a.gtld-servers.net
{{{
2 hpl.hp.com:
232 bytes, 1+0+6+6 records, response, noerror
query: 2 hpl.hp.com
authority: hp.com 172800 NS ns1.hp.com
authority: hp.com 172800 NS ns2.hp.com
authority: hp.com 172800 NS ns3.hp.com
authority: hp.com 172800 NS ns4.hp.com
authority: hp.com 172800 NS ns5.hp.com
authority: hp.com 172800 NS ns6.hp.com
additional: ns1.hp.com 172800 A 15.219.145.12
additional: ns2.hp.com 172800 A 15.219.160.12
additional: ns3.hp.com 172800 A 15.211.192.12
additional: ns4.hp.com 172800 A 15.203.224.14
additional: ns5.hp.com 172800 A 15.195.192.37
additional: ns6.hp.com 172800 A 15.195.208.12
}}}

親と同居

$ dnsq ns hpl.hp.com ns1.hp.com
{{{
2 hpl.hp.com:
377 bytes, 1+10+0+10 records, response, authoritative, noerror
query: 2 hpl.hp.com
answer: hpl.hp.com 300 NS lpans5.hpl.hp.com
answer: hpl.hp.com 300 NS ns3.hp.com
answer: hpl.hp.com 300 NS ns1.hp.com
answer: hpl.hp.com 300 NS ns6.hp.com
answer: hpl.hp.com 300 NS lpans6.hpl.hp.com
answer: hpl.hp.com 300 NS ns4.hp.com
answer: hpl.hp.com 300 NS am3.hp.com
answer: hpl.hp.com 300 NS lbrns5.hpl.hp.com
answer: hpl.hp.com 300 NS ns5.hp.com
answer: hpl.hp.com 300 NS ns2.hp.com
additional: am3.hp.com 28800 A 15.243.160.50
additional: ns1.hp.com 28800 A 15.219.145.12
additional: ns2.hp.com 28800 A 15.219.160.12
additional: ns3.hp.com 28800 A 15.211.192.12
additional: ns4.hp.com 28800 A 15.203.224.14
additional: ns5.hp.com 28800 A 15.195.192.37
additional: ns6.hp.com 28800 A 15.195.208.12
additional: lbrns5.hpl.hp.com 300 A 15.203.240.11
additional: lpans5.hpl.hp.com 300 A 15.243.224.21
additional: lpans6.hpl.hp.com 300 A 15.243.224.20
}}}