It can be anything! An apex, subdomain, or even a URL.

Results forspf.arrowbow.hypernode.io

Resolver

Location

TXT

Name	TTL	Value
spf.arrowbow.hypernode.io	600	v=spf1 ip4:46.21.227.0/24 ip4:46.21.234.32/27 ip4:87.233.77.245 ip4:46.21.235.128/26 ip4:46.21.235.192/26 include:_mailcluster.transip.email ?all