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

Results forspf.cdmon.com

Resolver

Location

TXT

Name	TTL	Value
spf.cdmon.com	300	v=spf1 ip4:46.16.58.86 ip4:46.16.60.83 ip4:46.16.60.84 ip4:46.16.60.85 ip4:46.16.60.89 ip4:46.16.60.241 ip4:46.16.56.6 ip4:185.66.40.5 ip4:46.16.60.136 -all