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

Results forspf1.setrow.com

Resolver

Location

TXT

Name	TTL	Value
spf1.setrow.com	300	v=spf1 ip4:185.131.208.0/22 ip4:92.45.72.0/24 ip4:195.244.35.64/26 ip4:212.252.27.0/24 ip4:91.191.172.53 ip4:91.191.174.129/28 ip4:77.223.128.33/28 ip4:212.252.24.128/25 ip4:91.93.132.2 ip4:77.223.131.28 ~all