spf.betrend.com has no NS records.
NS records for this zone are defined at betrend.com.
NS records for this zone are defined at betrend.com.
Question and response
Question
dig spf.betrend.com. NS
Answer
The response has no answer records.
Authority
betrend.com. 2560 SOA ns.jp.betrend.com. bt_mis.betrend.com. 1772005205 16384 2048 1048576 2560
Additional
The response has no additional records.