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

Results forspf.weaver.ch

Resolver

Location

TXT

Name	TTL	Value
spf.weaver.ch	28	v=spf1 ip4:185.90.37.63 ip4:185.90.37.64 ip4:185.90.37.65 ip4:185.90.37.107 ip4:185.90.37.108 ip4:185.90.37.132 ip4:185.90.37.247 ip4:185.90.37.249 ip4:185.90.37.250 ip4:185.90.37.253 ip4:185.90.37.251 ~all