mail.nfv.gtt.net has no NS records.
NS records for this zone are defined at nfv.gtt.net.
NS records for this zone are defined at nfv.gtt.net.
Question and response
Question
dig mail.nfv.gtt.net. NS
Answer
The response has no answer records.
Authority
nfv.gtt.net. 600 SOA ns5-build.gtt.net. hostmaster.gtt.net. 2026031202 10800 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0