mail01.edunao.com has no NS records.
NS records for this zone are defined at edunao.com.
NS records for this zone are defined at edunao.com.
Question and response
Question
dig mail01.edunao.com. NS
Answer
The response has no answer records.
Authority
edunao.com. 300 SOA dns12.ovh.net. tech.ovh.net. 2026031928 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0