5540930.spf08.hubspotemail.net has no NS records.
NS records for this zone are defined at spf08.hubspotemail.net.
NS records for this zone are defined at spf08.hubspotemail.net.
Question and response
Question
dig 5540930.spf08.hubspotemail.net. NS
Answer
The response has no answer records.
Authority
spf08.hubspotemail.net. 180 SOA ns10.digicertdns.com. dns.digicertdns.com. 2009010106 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0