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

Results forwebsites-strict.vertouk.net

Resolver

Location

TXT

Name	TTL	Value
websites-strict.vertouk.net	300	v=spf1 ip4:94.229.161.161 ip4:109.108.131.199 ip4:45.145.101.75 ip4:45.131.138.166 -all