spf.defgo.com has no NS records.
NS records for this zone are defined at defgo.com.
NS records for this zone are defined at defgo.com.
Question and response
Question
dig spf.defgo.com. NS
Answer
The response has no answer records.
Authority
defgo.com. 3600 SOA ns41.domaincontrol.com. dns.jomax.net. 2025111900 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0