_spf2.superoffice.com has no NS records.
NS records for this zone are defined at superoffice.com.
NS records for this zone are defined at superoffice.com.
Question and response
Question
dig _spf2.superoffice.com. NS
Answer
The response has no answer records.
Authority
superoffice.com. 1500 SOA dns1.cscdns.net. hostmaster.cscdns.net. 2018082268 10000 1800 604800 1500
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0