_sipfederationtls.iristransport.net has no NS records.
NS records for this zone are defined at iristransport.net.
NS records for this zone are defined at iristransport.net.
Question and response
Question
dig _sipfederationtls.iristransport.net. NS
Answer
The response has no answer records.
Authority
iristransport.net. 900 SOA ns1.iristransport.net. hostmaster.iristransport.net. 2021120100 10800 15 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0