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

Results forspf6.casefox.com

Resolver

Location

TXT

Name	TTL	Value
spf6.casefox.com	600	v=spf1 ip4:136.143.160.0/24 ip4:165.173.128.0/24 ip4:135.84.82.0/24 ip4:136.143.161.0/24 ip4:136.143.162.0/24 ip6:2607:13c0:1::7000/116 ip6:2607:13c0:2::1000/116 ip6:2607:13c0:4::/116 ~all