auth01.nhn.ic has no NS records.
NS records for this zone are defined at ic..
NS records for this zone are defined at ic..
Question and response
Question
dig auth01.nhn.ic. NS
Answer
The response has no answer records.
Authority
. 86400 SOA a.root-servers.net. nstld.verisign-grs.com. 2026031900 1800 900 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0