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

Results forspf5.casefox.com

Resolver

Location

TXT

Name	TTL	Value
spf5.casefox.com	600	v=spf1 ip4:162.211.121.224/28 ip4:162.211.121.240/29 ip4:103.117.159.0/24 ip4:169.148.135.0/24 ip4:199.67.76.0/22 ip4:103.103.198.0/24 ip4:169.148.137.0/24 ip4:103.103.199.0/24 ip4:135.84.81.0/24 ip4:135.84.83.0/24 include:spf6.casefox.com ~all