DNS/co.krについて、ここに記述してください。 

%dnsq ns co.kr b.dns.kr                                                                     ~
2 co.kr:
275 bytes, 1+6+0+8 records, response, authoritative, noerror
query: 2 co.kr
answer: co.kr 86400 NS f.dns.kr
answer: co.kr 86400 NS c.dns.kr
answer: co.kr 86400 NS g.dns.kr
answer: co.kr 86400 NS b.dns.kr
answer: co.kr 86400 NS e.dns.kr
answer: co.kr 86400 NS d.dns.kr
additional: b.dns.kr 86400 A 61.74.75.1
additional: c.dns.kr 86400 A 203.248.246.220
additional: d.dns.kr 86400 A 203.83.159.1
additional: e.dns.kr 86400 A 202.30.124.100
additional: e.dns.kr 86400 28 \040\001\015\314\000\005\000\000\000\000\000\000\000\000\001\000
additional: f.dns.kr 86400 A 218.38.181.90
additional: g.dns.kr 86400 A 202.31.190.1
additional: g.dns.kr 86400 28 \040\001\015\305\000\012\000\000\000\000\000\000\000\000\000\001