tank.division57.com has no NS records.
NS records for this zone are defined at division57.com.
NS records for this zone are defined at division57.com.
Question and response
Question
dig tank.division57.com. NS
Answer
The response has no answer records.
Authority
division57.com. 86400 SOA division57.com. hostmaster.division57.com. 2000122924 10800 3600 608400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0