mxbackup03.mail.btireland.net has no NS records.
NS records for this zone are defined at btireland.net.
NS records for this zone are defined at btireland.net.
Question and response
Question
dig mxbackup03.mail.btireland.net. NS
Answer
The response has no answer records.
Authority
btireland.net. 3600 SOA auth02.ns.btireland.net. hostmaster.btireland.net. 2026021201 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0