TLD/edu/usc.eduについて、ここに記述してください。

http://www.huque.com/app/dnsstat/detail/usc.edu/

$ dnsq ns usc.edu a.root-servers.net

2 usc.edu:
260 bytes, 1+0+6+7 records, response, noerror
query: 2 usc.edu
authority: edu 172800 NS a.edu-servers.net
authority: edu 172800 NS c.edu-servers.net
authority: edu 172800 NS d.edu-servers.net
authority: edu 172800 NS f.edu-servers.net
authority: edu 172800 NS g.edu-servers.net
authority: edu 172800 NS l.edu-servers.net
additional: a.edu-servers.net 172800 A 192.5.6.30
additional: c.edu-servers.net 172800 A 192.26.92.30
additional: d.edu-servers.net 172800 A 192.31.80.30
additional: f.edu-servers.net 172800 A 192.35.51.30
additional: g.edu-servers.net 172800 A 192.42.93.30
additional: l.edu-servers.net 172800 A 192.41.162.30
additional: g.edu-servers.net 172800 AAAA 2001:503:cc2c::2:36

$ dnsq ns usc.edu a.edu-servers.net

2 usc.edu:
221 bytes, 1+0+5+5 records, response, noerror
query: 2 usc.edu
authority: usc.edu 172800 NS nserver.apple.com
authority: usc.edu 172800 NS uucp-gw-1.pa.dec.com
authority: usc.edu 172800 NS ns1.usc.edu
authority: usc.edu 172800 NS ns2.usc.edu
authority: usc.edu 172800 NS ns3.usc.edu
additional: nserver.apple.com 172800 A 17.254.0.50
additional: uucp-gw-1.pa.dec.com 172800 A 204.123.2.18
additional: ns1.usc.edu 172800 A 68.181.190.250
additional: ns2.usc.edu 172800 A 68.181.195.29
additional: ns3.usc.edu 172800 A 50.59.168.11

$ dnsq a uucp-gw-1.pa.dec.com 208.109.255.7

1 uucp-gw-1.pa.dec.com:
106 bytes, 1+1+2+0 records, response, authoritative, noerror
query: 1 uucp-gw-1.pa.dec.com
answer: uucp-gw-1.pa.dec.com 86400 A 204.123.2.18
authority: dec.com 3600 NS ns13.domaincontrol.com
authority: dec.com 3600 NS ns12.domaincontrol.com

$ dnsname 204.123.2.18

ns3.hpl.hp.com

$ dnsq ns usc.edu uucp-gw-1.pa.dec.com

2 usc.edu:
189 bytes, 1+5+0+3 records, response, authoritative, noerror
query: 2 usc.edu
answer: usc.edu 3600 NS nserver.apple.com
answer: usc.edu 3600 NS uucp-gw-1.pa.dec.com
answer: usc.edu 3600 NS ns1.usc.edu
answer: usc.edu 3600 NS ns2.usc.edu
answer: usc.edu 3600 NS ns3.usc.edu
additional: ns1.usc.edu 3600 A 68.181.190.250
additional: ns2.usc.edu 3600 A 68.181.195.29
additional: ns3.usc.edu 3600 A 50.59.168.11

$ dnsq ns usc.edu 204.123.2.18

2 usc.edu:
189 bytes, 1+5+0+3 records, response, authoritative, noerror
query: 2 usc.edu
answer: usc.edu 3600 NS uucp-gw-1.pa.dec.com
answer: usc.edu 3600 NS ns1.usc.edu
answer: usc.edu 3600 NS ns2.usc.edu
answer: usc.edu 3600 NS ns3.usc.edu
answer: usc.edu 3600 NS nserver.apple.com
additional: ns1.usc.edu 3600 A 68.181.190.250
additional: ns2.usc.edu 3600 A 68.181.195.29
additional: ns3.usc.edu 3600 A 50.59.168.11
tmaeno@tmaeno:~$ dnsq a uucp-gw-1.pa.dec.com a.gtld-servers.net
1 uucp-gw-1.pa.dec.com:
122 bytes, 1+0+2+2 records, response, noerror
query: 1 uucp-gw-1.pa.dec.com
authority: dec.com 172800 NS ns13.domaincontrol.com
authority: dec.com 172800 NS ns14.domaincontrol.com
additional: ns13.domaincontrol.com 172800 A 216.69.185.7
additional: ns14.domaincontrol.com 172800 A 208.109.255.7
tmaeno@tmaeno:~$ dnsq a uucp-gw-1.pa.dec.com 208.109.255.7
1 uucp-gw-1.pa.dec.com:
106 bytes, 1+1+2+0 records, response, authoritative, noerror
query: 1 uucp-gw-1.pa.dec.com
answer: uucp-gw-1.pa.dec.com 86400 A 204.123.2.18
authority: dec.com 3600 NS ns13.domaincontrol.com
authority: dec.com 3600 NS ns12.domaincontrol.com