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

Results forspf-a.rjf.com

Resolver

Location

TXT

Name	TTL	Value
spf-a.rjf.com	3600	v=spf1 ip4:170.12.104.0/22 ip4:170.12.159.0/24 ip4:170.12.166.0/24 ip4:185.61.213.35 ip4:170.12.234.0/24 ip4:170.12.233.0/24 ip4:170.12.106.99 ip4:148.163.147.43 ip4:148.163.155.238 ip4:167.212.16.0/24 ~all