sug.t4tel.com has no NS records.
NS records for this zone are defined at t4tel.com.
NS records for this zone are defined at t4tel.com.
Question and response
Question
dig sug.t4tel.com. NS
Answer
The response has no answer records.
Authority
t4tel.com. 3600 SOA corp1.division57.com. hostmaster.division57.com. 2011101960 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0