ccTLD/uk/mil.ukについて、ここに記述してください。
mil.uk は mod.uk の別称
$ dnsq ns mil.uk nsd.nic.uk
2 mil.uk: 256 bytes, 1+1+5+6 records, response, authoritative, noerror query: 2 mil.uk answer: mil.uk 172800 CNAME mod.uk authority: mod.uk 172800 NS ns1.cs.ucl.ac.uk authority: mod.uk 172800 NS ns1.mod.uk authority: mod.uk 172800 NS ns2.mod.uk authority: mod.uk 172800 NS ns1.nic.uk authority: mod.uk 172800 NS relay.mod.uk additional: ns1.cs.ucl.ac.uk 172800 A 128.16.5.32 additional: ns1.mod.uk 172800 A 94.236.30.111 additional: ns1.nic.uk 172800 A 195.66.240.130 additional: ns1.nic.uk 172800 AAAA 2a01:40:1001:35::2 additional: ns2.mod.uk 172800 A 94.236.30.112 additional: relay.mod.uk 172800 A 194.61.92.13
$ dnsq ns mod.uk ns1.mod.uk
2 mod.uk: 142 bytes, 1+4+0+2 records, response, authoritative, noerror query: 2 mod.uk answer: mod.uk 7200 NS ns1.nic.uk answer: mod.uk 7200 NS ns1.cs.ucl.ac.uk answer: mod.uk 7200 NS ns1.mod.uk answer: mod.uk 7200 NS ns2.mod.uk additional: ns1.mod.uk 7200 A 94.236.30.111 additional: ns2.mod.uk 7200 A 94.236.30.112
ns1.nic.uk などは親のNSだ。
$ dnsq a www.mod.uk ns1.mod.uk
1 www.mod.uk: 86 bytes, 1+1+0+0 records, response, authoritative, noerror query: 1 www.mod.uk answer: www.mod.uk 7200 CNAME redirector-cdn.production.govuk.service.gov.uk