spf.avature.cn has no NS records.
NS records for this zone are defined at avature.cn.
NS records for this zone are defined at avature.cn.
Question and response
Question
dig spf.avature.cn. NS
Answer
The response has no answer records.
Authority
avature.cn. 900 SOA ns-1154.awsdns-cn-08.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 360
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0