mail.bits.net.do has no NS records.
NS records for this zone are defined at bits.net.do.
NS records for this zone are defined at bits.net.do.
Question and response
Question
dig mail.bits.net.do. NS
Answer
The response has no answer records.
Authority
bits.net.do. 300 SOA ns1.bluehost.com. root.box5223.bluehost.com. 2021071500 86400 7200 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0