mail.sentris.net has no NS records.
NS records for this zone are defined at sentris.net.
NS records for this zone are defined at sentris.net.
Question and response
Question
dig mail.sentris.net. NS
Answer
The response has no answer records.
Authority
sentris.net. 14400 SOA ns.wahju.com. hostmaster.sentris.net. 2020061612 14400 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0