mx.grindertank.cc has no NS records.
NS records for this zone are defined at grindertank.cc.
NS records for this zone are defined at grindertank.cc.
Question and response
Question
dig mx.grindertank.cc. NS
Answer
The response has no answer records.
Authority
grindertank.cc. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1773753196 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0