spf.guestclub.net has no NS records.
NS records for this zone are defined at guestclub.net.
NS records for this zone are defined at guestclub.net.
Question and response
Question
dig spf.guestclub.net. NS
Answer
The response has no answer records.
Authority
guestclub.net. 300 SOA ns1.design69.net. hostmaster.design69.net. 2017111754 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0