mail.sonic.net has no NS records.
NS records for this zone are defined at sonic.net.
NS records for this zone are defined at sonic.net.
Question and response
Question
dig mail.sonic.net. NS
Answer
The response has no answer records.
Authority
sonic.net. 86400 SOA a.auth-ns.sonic.net. hostmaster.sonic.net. 2026022501 10800 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0