1. TLD/org/isc.org
$ dnsq ns isc.org a.root-servers.net
2 isc.org: 427 bytes, 1+0+6+12 records, response, noerror query: 2 isc.org authority: org 172800 NS a0.org.afilias-nst.info authority: org 172800 NS a2.org.afilias-nst.info authority: org 172800 NS b0.org.afilias-nst.org authority: org 172800 NS b2.org.afilias-nst.org authority: org 172800 NS c0.org.afilias-nst.info authority: org 172800 NS d0.org.afilias-nst.org additional: a0.org.afilias-nst.info 172800 A 199.19.56.1 additional: a2.org.afilias-nst.info 172800 A 199.249.112.1 additional: b0.org.afilias-nst.org 172800 A 199.19.54.1 additional: b2.org.afilias-nst.org 172800 A 199.249.120.1 additional: c0.org.afilias-nst.info 172800 A 199.19.53.1 additional: d0.org.afilias-nst.org 172800 A 199.19.57.1 additional: a0.org.afilias-nst.info 172800 AAAA 2001:500:e::1 additional: a2.org.afilias-nst.info 172800 AAAA 2001:500:40::1 additional: b0.org.afilias-nst.org 172800 AAAA 2001:500:c::1 additional: b2.org.afilias-nst.org 172800 AAAA 2001:500:48::1 additional: c0.org.afilias-nst.info 172800 AAAA 2001:500:b::1 additional: d0.org.afilias-nst.org 172800 AAAA 2001:500:f::1
$ dnsq ns isc.org 199.19.56.1
2 isc.org: 256 bytes, 1+0+4+6 records, response, noerror query: 2 isc.org authority: isc.org 86400 NS ord.sns-pb.isc.org authority: isc.org 86400 NS ns.isc.afilias-nst.info authority: isc.org 86400 NS ams.sns-pb.isc.org authority: isc.org 86400 NS sfba.sns-pb.isc.org additional: ams.sns-pb.isc.org 86400 A 199.6.1.30 additional: ams.sns-pb.isc.org 86400 AAAA 2001:500:60::30 additional: ord.sns-pb.isc.org 86400 A 199.6.0.30 additional: ord.sns-pb.isc.org 86400 AAAA 2001:500:71::30 additional: sfba.sns-pb.isc.org 86400 A 149.20.64.3 additional: sfba.sns-pb.isc.org 86400 AAAA 2001:4f8::2:0:0:0:19