apac.nttdata.com has no NS records.
NS records for this zone are defined at nttdata.com.
NS records for this zone are defined at nttdata.com.
Question and response
Question
dig apac.nttdata.com. NS
Answer
The response has no answer records.
Authority
nttdata.com. 3600 SOA ns01.nttdata.co.jp. postmaster.nttdata.co.jp. 2026022701 3600 1800 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0