mail.bsfstest.com has no NS records.
NS records for this zone are defined at bsfstest.com.
NS records for this zone are defined at bsfstest.com.
Question and response
Question
dig mail.bsfstest.com. NS
Answer
The response has no answer records.
Authority
bsfstest.com. 3600 SOA rns1.rightsdns.com. domain.master.brights.jp. 2025062400 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0