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

Results forspf.email-hosting.net.au

Resolver

Location

TXT

Name	TTL	Value
spf.email-hosting.net.au	14400	v=spf1 +include:ip4-syd-au.hostedmail.net.au +include:ip4-mel-au.hostedmail.net.au +include:ip6-syd-au.hostedmail.net.au +include:ip6-mel-au.hostedmail.net.au -all