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

Results forspf1.casefox.com

Resolver

Location

TXT

Name	TTL	Value
spf1.casefox.com	600	v=spf1 ip4:206.55.144.0/20 ip4:24.110.64.0/18 ip4:209.61.151.0/24 ip4:166.78.68.0/22 ip4:198.61.254.0/23 ip4:192.237.158.0/23 ip4:23.253.182.0/23 ip4:104.130.96.0/28 ip4:146.20.113.0/24 ip4:146.20.191.0/24 include:spf2.casefox.com ~all