mailrelay2b.balt.net has no NS records.
NS records for this zone are defined at balt.net.
NS records for this zone are defined at balt.net.
Question and response
Question
dig mailrelay2b.balt.net. NS
Answer
The response has no answer records.
Authority
balt.net. 60 SOA dns1.balt.net. hostmaster.balt.net. 2012073742 3600 900 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0