1. ccTLD/ie
dec.com からみで調査 ucd.ie
$ dnsq ns ucd.ie a.root-servers.net
2 ucd.ie: 413 bytes, 1+0+8+11 records, response, noerror query: 2 ucd.ie authority: ie 172800 NS a.iedr.ie authority: ie 172800 NS b.iedr.ie authority: ie 172800 NS c.iedr.ie authority: ie 172800 NS d.iedr.ie authority: ie 172800 NS ns3.ns.esat.net authority: ie 172800 NS gns1.domainregistry.ie authority: ie 172800 NS gns2.domainregistry.ie authority: ie 172800 NS ns-ie.nic.fr additional: a.iedr.ie 172800 A 77.72.72.44 additional: b.iedr.ie 172800 A 77.72.72.34 additional: c.iedr.ie 172800 A 194.146.106.98 additional: d.iedr.ie 172800 A 77.72.229.245 additional: ns3.ns.esat.net 172800 A 192.111.39.100 additional: gns1.domainregistry.ie 172800 A 198.133.199.102 additional: gns2.domainregistry.ie 172800 A 198.133.199.103 additional: ns-ie.nic.fr 172800 A 192.93.0.4 additional: a.iedr.ie 172800 AAAA 2a01:4b0::3 additional: b.iedr.ie 172800 AAAA 2a01:4b0::2 additional: ns3.ns.esat.net 172800 AAAA 2001:7c8:2:a::64
$ dnsq ns ucd.ie a.iedr.ie
2 ucd.ie: 271 bytes, 1+0+6+4 records, response, noerror query: 2 ucd.ie authority: ucd.ie 172800 NS scsnms.switch.ch authority: ucd.ie 172800 NS sec-ns.tcd.ie authority: ucd.ie 172800 NS auth-ns1.ucd.ie authority: ucd.ie 172800 NS auth-ns2.ucd.ie authority: ucd.ie 172800 NS uucp-gw-1.pa.dec.com authority: ucd.ie 172800 NS uucp-gw-2.pa.dec.com additional: auth-ns1.ucd.ie 172800 A 137.43.132.53 additional: auth-ns2.ucd.ie 172800 A 137.43.132.54 additional: auth-ns1.ucd.ie 172800 AAAA 2001:770:98:200::35:1 additional: auth-ns2.ucd.ie 172800 AAAA 2001:770:98:200::35:2