8422896.spf07.hubspotemail.net has no NS records.
NS records for this zone are defined at spf07.hubspotemail.net.
NS records for this zone are defined at spf07.hubspotemail.net.
Question and response
Question
dig 8422896.spf07.hubspotemail.net. NS
Answer
The response has no answer records.
Authority
spf07.hubspotemail.net. 180 SOA ns10.digicertdns.com. dns.digicertdns.com. 2009010109 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0