mx.halftheworld.cc has no NS records.
NS records for this zone are defined at halftheworld.cc.
NS records for this zone are defined at halftheworld.cc.
Question and response
Question
dig mx.halftheworld.cc. NS
Answer
The response has no answer records.
Authority
halftheworld.cc. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1773753202 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0