spf01.sabacloud.com has no NS records.
NS records for this zone are defined at sabacloud.com.
NS records for this zone are defined at sabacloud.com.
Question and response
Question
dig spf01.sabacloud.com. NS
Answer
The response has no answer records.
Authority
sabacloud.com. 1800 SOA ns1.p05.dynect.net. hostmaster.humanconcepts.com. 68418 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0